Top teams McLaren and Red Bull have questioned whether F1 should have tested last week.

Since the sport clamped down hard on private testing for cost reasons some years ago, there remained many in the paddock – notably Ferrari – who argued that at least some in-season testing should still take place.

So, for 2012, it was agreed that Mugello would host a three-day session in between the Bahrain and Spanish grands prix.

Every team except HRT attended.

But there were rumblings that not everyone was happy. McLaren, in fact, did not even send its race drivers Jenson Button and Lewis Hamilton to Tuscany.

Then, on Friday in Spain, the British team’s regular duo was busily testing in official practice, fielding extravagant sensors and experimental components.

“We would have had a very similar programme whether we went to Mugello or not,” said sporting director Sam Michael.

“All the teams are geared up to not have testing, to not having test teams and that means we’re equipped and do our planning to do all of that work on Friday.

“I think the (Mugello) test itself, personally, I think you could do without it,” Michael continued. “I think it’s a lot of energy and expense during the season that we probably don’t need.

“Of course McLaren will gain a lot out of that test but formula one is all relative, so all we really did was spend a load of money.”

Red Bull’s technical boss Adrian Newey agreed.

“I think we learnt the pasta in Italy is still the best in the world and that’s about it really,” he said when asked about the Mugello test.

“I’d agree with what Sam says. To me, yes you go to the test because it’s available. We all spent money but the value of in-season testing has to be questionable.”

Jaime Alguersuari has concluded he made “a mistake” to remain loyal to Red Bull late last season.

After testing Pirelli’s 2010 Renault car last week at Jerez, the Spaniard moved on to Barcelona to continue his work as a co-commentator for British radio.

However, he revealed recently that he might have been on the 2012 grid, had he not believed Red Bull executives who told him he would be at Toro Rosso this year.

“It was definitely a mistake not to negotiate with other teams,” said the Spaniard, “as I had the opportunity and declined offers,” he told Marca sports newspaper.

“I did that because I had loyalty to Red Bull.”

Asked if he has talked with anyone from Red Bull since his dismissal, the 22-year-old revealed: “The directors, no, the technical team, yes.”

It still pains him that, in explaining their decision, the Red Bull officials like Dr Helmut Marko insisted Alguersuari was not a potential winner.

“If you think that for six years they supported me then they changed their opinion overnight. One day you have a champion, the next you don’t,” he said.

Volkswagen, the German carmaking giant, has played down suggestions it could launch a formula one project some time soon.

“There are always rumours about Volkswagen and formula one,” said Jost Capito, who has taken over from Kris Nissen as the head of the Wolfsburg-based company’s motor racing boss.

However, he is quoted by Germany’s Sport1 as insisting that VW is only concentrating on its world rally programme.

“The WRC programme is approved from 2013 to 2015,” Capito insisted. “There is no room to think about anything else.

“It (F1) is not on our radar,” he is also quoted as saying by France’s L’Equipe. “Our hands are full already.”

In the wake of BMW, Honda and Toyota’s departures, the only mass production carmakers in F1 are Renault – as an engine supplier – and Mercedes.

Ferrari, McLaren, Lotus and Caterham produce niche sports cars.

A tension has crept into F1 drivers’ relationships, as they look ahead to a fiery meeting at the Barcelona circuit on Friday.

Fernando Alonso had given the first hints about the tension when he hit out at Nico Rosberg’s aggressive tactics in Bahrain three weeks ago.

And earlier this week, the Spaniard insisted there is not enough “respect” between the drivers when they are jostling for position at grands prix.

“Fernando made it pretty clear,” world champion Sebastian Vettel told reporters on Thursday. “He said ‘you have to leave the space — all the time you have to leave the space!’”

Rosberg said he is happy if discussions about his driving take place this weekend, but also in the firing line is Lewis Hamilton, who passed the Mercedes driver on the asphalt run-off in Bahrain.

“I was surprised Lewis was allowed to keep his position,” said Mark Webber.

“I’m sure we’ll talk about it in the drivers’ briefing.”

McLaren’s Hamilton insisted he did nothing wrong, but he added: “I’m not really bothered. It’s good to have clarity.

“Mark is probably one of the most – if not the most – outspoken individuals here (in F1), so that is the least I expect from him.”

Also among the most aggressive – and regularly criticised – drivers is Michael Schumacher, and he insisted that the FIA is fully able to make judgements about incidents.

“If it’s not within the rules the FIA would have taken action,” said the seven time world champion, referring to the incidents in Bahrain. “They didn’t and I didn’t see anything wrong either.”

F1 needs to resolve its dispute with Mercedes before the sport’s multi-billion dollar floatation plans can go ahead.

That is the warning of the German team’s chief executive Nick Fry, as Mercedes refuses to sign up to the new Concorde Agreement because rival top teams Ferrari, McLaren and Red Bull have been offered better deals.

Fry is quoted by The Times newspaper as admitting that the progress of talks with Bernie Ecclestone are “not as strong as I would like”.

But he warned: “If CVC wish to float F1, I think they need this resolved fairly quickly — possibly more than we need it resolved.”

At the same time, he played down speculation Mercedes is on the verge of quitting F1.

“The mindset is absolutely in capital letters: Mercedes-Benz wishes to be in F1,” Fry insisted. “I would add that F1 also needs Mercedes-Benz.

“I am completely convinced in my mind that if CVC wish to sell some or all of F1, the value they can derive from that would be severely diminished if Mercedes was not a participant.”

But a senior executive of Mercedes denied the spat is about money.

“It is about fairness,” the unnamed official told The Times’ Kevin Eason.

“We are facing a situation in which three teams will between them decide some of the biggest issues in formula one. That cannot be right.”

Niki Lauda is sure Michael Schumacher will return to the top step of the podium this year.

As Mercedes took a step forwards with its new W03 car in 2012, it was the famous seven time world champion’s teammate Nico Rosberg who tasted success first, securing pole and victory in China last month.

But triple world champion Lauda told Germany’s Bild newspaper: “Michael Schumacher will win this year.

“Finally Mercedes are good enough to be able to attack the best.”

Schumacher, 43, has not been on the podium since he returned to F1 in 2010.

The German has also played down the team’s chances on the demanding Circuit de Catalunya this weekend, even though Mercedes is debuting a new ultra-light carbon gearbox in Barcelona.

Lauda, meanwhile, played down Schumacher’s widely-reported criticisms of this year’s Pirelli tyres, which have seen him labelled either a sore loser or a spoil-sport amid the exciting 2012 season.

“Schumi can’t spoil formula one,” laughed the Austrian legend. “He has been in the business so many years — he knows how it works.

“I see Rosberg’s success as spurring him on rather than frustrating him. He will fight through it,” predicted Lauda.

Rubens Barrichello has alleged that Ferrari made a threat that might have ended his motor racing career during the infamous 2002 Austrian grand prix.

Ten years ago, the Brazilian led the race at the A1-Ring but eventually, at the very last corner, succumbed to team orders that allowed number one teammate Michael Schumacher to pass him.

Subsequent video footage has depicted then Ferrari team boss Jean Todt asking Barrichello on the radio to simply “let Michael pass for the championship, please”.

But Barrichello, having left F1 at the end of 2011 for a seat in Indycar, says it was not quite as simple as that.

“It was eight laps of war,” he is quoted by Brazil’s Globo.

“It’s very rare that I lose my temper, but I was screaming on the radio. I kept going right to the end, saying I would not let him pass.

“That’s when they said something about something much broader. It was not about the contract.

“I cannot tell you what they said, but it was a form of threat that made me think about re-thinking my life, because the great joy for me was driving,” said the 39-year-old.

Nineteen years of formula one did not prepare Rubens Barrichello for his first taste of driving an Indycar on a high speed oval.

The former Ferrari driver, who switched categories for the 2012 season after losing his Williams race seat, tested at the Texas Motor Speedway on Monday.

“It was bloody fast,” he is quoted by the Associated Press, “and very, very much different than anything I have ever tried.

“I’ve had places that in formula one that they say ‘Oh, it’s almost flat and it’s a big corner and it’s a big challenge’. But the walls were never so close,” the 39-year-old Brazilian enthused.

Barrichello’s teammate Tony Kanaan admitted it was “fun” and a rare sight to see his close friend “nervous” prior to getting into a racing car.

“It was quite exciting to see how excited he got, and how happy he got out of the car saying how awesome it is,” he said.

Food giant Nestle’s boss has confirmed he is set to enter the world of formula one.

Austrian businessman Peter Brabeck-Letmathe confirmed to Kleine Zeitung newspaper that he has been lined up to chair the sport’s parent company once it has floated on the Singapore exchange.

“That’s right,” said the 67-year-old.

“And it’s true that I have agreed to take over the chairmanship of the supervisory board in a non-executive function.

“If formula one is to be a public company then it is important that the chairman is independent.”

Brabeck-Letmathe confirmed that Bernie Ecclestone, 82, is remaining F1′s chief executive.

“We certainly hope that Bernie stays healthy for a long time and can keep on working,” he said.

“I am already impressed with his performance. But of course it is the task of a supervisory board to ensure the succession of a business.

“At Nestle, I have always ensured that everyone can be replaced from the executive board within 24 hours. So we need to think about how to replace Bernie Ecclestone as well.”

Rubens Barrichello is still refusing to give up on his formula one career.

After a record-setting 19 consecutive seasons on the grid, the 39-year-old Brazilian lost his Williams race seat for 2012 and switched to the premier American open-wheeler series, Indycar.

“I’m enjoying it,” insisted Barrichello to O Estado de S.Paulo newspaper.

“I have been welcomed and the feeling is a much more open one.

“But the fact that I keep active and am competing is, for me, still a way to be seen and to attract the eye of formula one.

“For all that I did in F1, I would be able to go back there,” added the former Ferrari and Honda driver.

After Sebastian Vettel’s first win of the season in Bahrain recently, Red Bull could now maintain its grip on 2012.

That is the claim of the legendary triple world champion Niki Lauda.

Red Bull has been the dominant force since late 2009 and 2010, and Vettel was untouchable last year as he successfully defended his drivers’ championship breakthrough.

But four different teams have won so far in 2012, and only the last of them were Red Bull and Vettel, as the energy drink-owned team’s superiority appeared to have waned.

After Bahrain, however, Red Bull and Vettel are back, Lauda told Germany’s Auto Bild Motorsport.

“In Bahrain, they got the car and the tyres right for the first time, and they won,” said the Austrian.

“They will have improved the car further in Mugello, so I see enormous potential for another dominant season,” he added.

Lauda acknowledged that the blown diffusers of the past seasons was Red Bull’s “great strength”, and now that is gone.

“Nevertheless, Red Bull is the team to beat,” he insisted.

F1 figures have mixed feelings after this week’s Mugello test.

Amid speculation the Ferrari owned circuit would like a spot on the race calendar, it emerged that the famous Maranello based team pushed hard for the Tuscan facility to host the first in-season test in many years.

“It’s very beautiful and the food is very good,” said Red Bull team boss Christian Horner, “but we are spending a lot of money and honestly we didn’t feel the need to come here.”

Indeed, the only circuits comparable to high speed Mugello on the F1 calendar are Monza, Spa and parts of Silverstone.

And testing at Barcelona prior to next weekend’s Spanish grand prix would have made infinitely more logistical sense.

Lotus team boss Eric Boullier said Mugello was “money spent needlessly”.

Of course, those in the Ferrari camp thought differently.

“I would do more tests during the season,” said Fernando Alonso. “One lap here is worth 100 at other places, without considering that one day here is worth a year’s work on the simulator”.

But Mark Webber said Mugello is too fast for a decent test circuit, but he was among those who enjoyed the layout.

And the Australian couldn’t understand McLaren’s opposition, which extended to both Lewis Hamilton and Jenson Button giving up their running to test drivers.

“It was an absolute no-brainer for (Sebastian Vettel and I) to be here,” said the Red Bull driver.

“Mileage is so limited these days that it’s good for me to be in the car. Any chance we get to drive the car in the real world, we’ll do it,” added Webber.

An obvious tension was evident at Mugello when Pirelli’s Paul Hembery was asked about Michael Schumacher.

The seven time world champion had slammed F1′s official supplier after Bahrain, arguing that the 2012 tyres degrade so quickly it makes driving a grand prix car as slow as a safety car.

“We haven’t spoken,” Briton Hembery is quoted by Germany’s Auto Motor und Sport. “I’ve just read something on the net about the tyres from his teammate Nico Rosberg which is very different.”

Asked if Schumacher’s criticism was irritating, he answered: “We built the tyres the way we were asked to.

“The FIA, Bernie Ecclestone, even the teams wanted it this way. The spokesman for the teams at the time was Ross Brawn, Schumacher’s team boss.

“There have been four different winners in the four races so far, which alone shows that we must have done something right,” Hembery insisted. “As a fan I would be thrilled.”

Asked if he can at least understand Schumacher’s frustration, he continued: “The four winners this year have not won by chance.

“They were absolutely the best drivers in those races and all of them were faster than their teammates.

“I can understand that Michael was frustrated at the last race. Among the four winners so far were two Germans, and then you had Kimi (Raikkonen), who in the fourth race of his comeback is on the podium.

“Racers are winners; they’re not happy unless they’re winning.”

Hembery denied that tyres have, in 2012, become more important than the cars or drivers.

“That’s a misconception,” he insisted. “The driver has a huge impact.

“Anyway I’m convinced that at Silverstone at the latest the teams will have the problem under control. Just as they did last year.”

Finally, he insisted that Pirelli is not going to make any knee-jerk reactions.

“If there are 23 drivers satisfied and only one dissatisfied, then I don’t think we need to change something,” Hembery is quoted by Bild newspaper.

Ferrari’s Fernando Alonso, however, acknowledged a slight frustration.

“For the top teams it’s a bit frustrating,” he told La Stampa newspaper, “when it’s difficult to exploit all your potential.

“It’s like Real Madrid, Barcelona and AC Milan suddenly playing with the budget of Cesena.”

Tuesday was a new experience for many F1 regulars; a rare in-season test on an unfamiliar track.

Some teams wanted the three-day session to take place at Barcelona, saving money ahead of the Spanish grand prix at the same venue, but Ferrari pushed hard – reportedly even waiving the circuit rental fees – for its circuit in Tuscany to get the nod.

The day did not start well weather-wise, but the spectators – reportedly 25,000, and visibly more than in Bahrain last weekend – came nonetheless.

“This is my first time here,” Sebastian Vettel, whose teammate Mark Webber kicked off proceedings for Red Bull on Tuesday, told Auto Motor und Sport.

Australian Webber, second fastest after the first morning behind crowd favourite Fernando Alonso, has been here before.

“I once did a sports car race here,” he said.

“It’s a bit too fast (for F1).”

Indeed, of the grand prix circuits, only Monza is faster. Nico Rosberg, in the Mercedes, gave Mugello a big thumbs up.

“1 to 10, I’d give it 8.5,” the German grinned.

It is an important test for Ferrari, but – contrary to earlier rumours – there is no ‘B’ car.

Alonso told La Gazzetta dello Sport that Mugello and then Barcelona next weekend will not make or break Ferrari’s championship.

“We need to catch up race after race,” said the Spaniard. “If we do poorly in Barcelona, it doesn’t mean our season is over.”

The French government is dashing to seal the lid on the country’s return to F1.

Bernie Ecclestone has said a deal has been reached to annually alternate a race between Paul Ricard in France and Belgium’s fabled Spa-Francorchamps.

But the final signature and official announcement are still missing.

David Douillet, the French sports minister, told Le Journal du Dimanche that the chance France will be on the 2013 calendar is “90 per cent”.

“The contract is going back and forth between the lawyers. I hope I get to London to meet with Bernie Ecclestone between Wednesday and Friday,” he added.

The newspaper said Douillet is dashing to complete the deal by this weekend’s presidential election, because socialist frontrunner Francois Hollande has hinted the grand prix project would be reviewed if he is elected.

Douillet admitted that it is “very likely” Hollande would “bury” the race.

Le JDD newspaper said organisers and Ecclestone have agreed the race sanctioning fee, EUR 22 million, which is still a few million short of guaranteeing a balanced budget.

And “without a balanced budget, we do not sign,” he warned. “The state, which does not participate financially, is still the guarantor of any debt.”

There also remains an odd silence from the Belgian side, who have not confirmed that Spa is the circuit that will alternate with France.