Uncertainty surrounds the future of the British Grand Prix after the deadline passed for Donington Park to prove it had funding. The racetrack won the right to host the event from Silverstone, but has so far failed to raise the cash to make it happen. It needed to raise £135 million by noon on Monday. Earlier this month, Donington launched a bond issue in an attempt to raise the money, but that proved unsuccessful. Silverstone stands ready to take back to the race, but will force a hard deal from Formula one boss Bernie Eccelstone.