Silverstone has written to Prime Minister David Cameron to try and halt state funding for the proposed Circuit of Wales, the BBC reports.

Silverstone is the current home of the British MotoGP, but the Circuit of Wales has made no secret of its desire to take over running of the event.

Circuit developers are said to have asked 'both the Welsh and UK governments for up to ?50m in total towards the scheme'.

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Silverstone, the BBC claims, feels that such funding would be potentially "illegal"