Sebastian Vettel's Italian Grand Prix victory for Scuderia Toro Rosso may have been a fairy-tale for a sport in turmoil over protests and tainted in recent years by espionage and intrigue, but it reignited another issue that had been quietly 'bubbling under'.

With Super Aguri long gone from Formula One after failing to keep up with the financial requirements of life in the top flight, Toro Rosso remains as the sole runner using equipment supplied by an outside agency. But, despite its Minardi underpinnings and the - now oft corrected - perception of it as a minnow, the Italian team is beginning to ruffle feathers off the track as well as on it as the 'customer car' row flickers back into life.

Opinion at Friday's press conference in Singapore was divided between those, admittedly with a vested interest, who felt that, in the current economic climate especially, third parties should be able to provide cars for willing entrants, and others who felt that their long-standing position as constructors was being jeopardised by the arrangement.

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"As an independent constructor, we looked on [at Monza] with great feelings," Williams CEO Adam Parr admitted magnanimously, "You cannot take away from [STR] what they achieved over the weekend - and congratulations to them. I think what it means for us is simply that we have to do the things that we do better. [It wasn't] a great take away from that weekend, but we have got to do better."

Williams, however, has been in Formula One for a long time - it celebrated its 500th grand prix on the same weekend as Toro Rosso took its maiden win - and has seen both sides of the coin when it comes to the highs and lows of Formula One. Through it all, however, it has remained a steadfast believer in the fact that the sport should be constructor-led, without the recourse for smaller teams to buy 'off the shelf' machinery and operate on far smaller budgets.

"We take our hats off to Gerhard and his team for what they did over that weekend and we had an opportunity to beat them, let's face it, and we didn't and so that's our problem," Parr continued, "In the longer term, however, we believe that customer cars have no place in Formula One.

"It's ultimately a design and engineering challenge as well as a racing challenge, and we believe that is the reason, for example, why this [Singapore] event is going to be so incredible. There is no other motorsport series in the world that could do what we're going to do here this weekend, and that's been built on the back of not just teams like Williams, but many teams. There are 53 teams since 1970 that have tried to design a chassis and compete in Formula One and have failed, which is nine out of every ten teams that have tried.

"I think that what we are doing here this weekend is built on a lot of history, and we passionately believe that that is the way forward for Formula One. Because of our respect for Gerhard and Red Bull, and what they put into the sport, we've agreed an arrangement for this [customer car] period which is temporary but, in the longer term, we must go back to being a sport of constructors. That's our view."

With both Toro Rosso team boss Gerhard Berger and Red Bull Racing principal Christian Horner sharing the dais, however, Parr was always likely to face an opposing view.

"I think you have to look at a bigger picture," Horner insisted, "I think that, today, we have ten teams, there are twelve potential entrants and there are only ten teams here - and I don't see other teams knocking on the door to come into Formula One, because to come in as a constructor is hugely prohibitive to have any chance to compete.

"With the global financial situation, and with the way that Formula One is, with the amount of manufacturers we also have in Formula One, whilst respecting Adam's and Williams' position, I'm afraid I disagree and feel that it's in the interests of Formula One to have a mix [of constructer and customer cars].

"It is good for a team such as Toro Rosso or Red Bull to win races. I'm sure Gerhard will answer the question for you, but for Toro Rosso to become a constructor is a massive, massive undertaking.

"Are the people in the grandstands and watching television really interested in how many wind tunnels we run, how many people we have working in R&D or CfD or stress finite element analysis or all these areas? I think that Formula One, at the end of the day, is a sport and, secondly, it's a show, and I think we need to address those issues and then concern ourselves about constructors and non-constructors. That would be my take on it."

"I think Christian spelt it out quite well. What is a customer car anyway? The definition is still very wide. I fully respect the position of Williams, but I have to say that times are changing, and time is also changing in the normal automobile industry where, today, there is co-operation between companies trying to use synergies, because otherwise they have no chance to survive in the market.

"Here in Formula One, we have ten teams, nobody is waiting to come in. I think we have a bigger chance to lose two teams than to get in another two teams. If we are sitting here and say 'well, we cannot think about synergies, getting costs down because Williams have invested into some areas some years ago', I think it's the wrong way.

"I think Formula One has to go on, to do what is right for Formula One and where Formula One has the best chance to end up with 24 competitive cars again - not cars that are running two laps behind just to fill the field - and making a good show, because, just as Christian says, nobody out in the grandstands is proud that we have 600 people. They want to see a race, that's what they want to see."

Berger and Horner's references to 'the people in the stands' echoes similar views put forward by both Bernie Ecclestone and Flavio Briatore in the past, concerned that F1 is not only spending too much, but is also populated by teams too wrapped in their own interests to see the bigger picture and start working towards a more stable future for all. Mercedes' Norbert Haug naturally found himself able to see both sides of the argument going on around him.

"I'm very open," he admitted, "I can understand a traditional constructor like Williams. They have contributed a lot in the past and I think we just need to find a way together.

"But concentrating on what is allowed currently, whether this is a customer team or not, I think the [STR] guys deserve all credit. I already pointed this out in Monza, and it is really what concerns me. It comes from my heart, it's not just a sing-song. It is really great what they achieved and it just shows how closely-fought Formula One is these days.

"And it doesn't come from nothing. Of course, they have a good technical package, but there are good guys involved, there are good racers involved in Gerhard, like Franz Tost, [Giorgio] Ascanelli. They know what they're talking about and I think it is pleasing. They shouldn't do it each and every race if possible, but they deserve their victory and their victory was a positive message for Formula One.

"I have to say I was pleased but, at the same time, I fully understand a traditional team like Williams, for they have contributed a lot to Formula One, and where Formula One is right now is partly due to Williams as well. I think you just need to get the right balance and I think that's internal stuff which we need to discuss. That is currently happening and I'm sure a solution will be in place in the future."

Customer cars have a stay of execution for one more season but, as things currently stand, teams like Toro Rosso will have to become fully fledged constructors in their own right from 2010. And that, as it stands, could cost the Italian team the funding that has lifted it out of its minnow status, for Red Bull brand magnate Dietrich Mateschitz has said that he is unwilling to fund two teams unless they can share technologies as at present.....