If most of the complainers are "new residents" then North Wiltshire District Council are to blame themselves for failing to disclose the proximity of the circuit and potential noise when the local searches are carried out!
I will willing write to Mr Marshall and offer my support to the circuit and suggest they review there own procedures!
I have previously read of a case where a dog kennel owner took the case to the EU after the local council tried to close it on noise ground and he won as the EU ruled he was entitled as a human right to run a legitimate buisness and earn a living.
Having a house near a circuit would be a bonus for me