Teams can either adhere to a £40million limit and be allowed to exploit greater technical freedoms or they can spend what they want but face constraining technical rules that would almost certainly render their cars uncompetitive. Ferrari chief Luca di Montezemolo has already threatened to withdraw his cars from the sport and BMWSauber's Mario Theissen is set to spell out his team's dissatisfaction at a meeting of the Formula One Teams' Association at Heathrow today.