THE future of a North-East racing circuit that generates £3m a year for the local economy depends on an Appeal Court decision over noise levels, motorsport chiefs said last night. Barristers for Croft Circuit, near Darlington, are trying to overturn an order to pay £150,000 to a couple and their daughter, who live next to the track. The family complained that their quality of life had been ruined by screeching tyres and revving engines. Race organisers say that if the decision is upheld, it could open the gates to countless compensation claims from neighbouring residents, jeopardising the long-term future of the venue. â