The two circuits mentioned as "central" are also the most costly to use unfortunately.
Oulton is available for track days for only a limited number of days during the track day season as it is mainly used for racing and no Sunday usage or evening use is allowed. For a summer week day there expect to pay about £14,000 + vat so it is not cheap by any means.
Donington as everyone knows has noise issues however if you want a loud day there which i think is 105 like at say Cadwell & Snetterton etc it will cost £18,000 + vat as far as i know.
For my 2p worth Snetterton even thoe out in the east is a great track with great facilities, so it is a great track all year round, also Norfolk also as some great weather "out of season" . Cadwell park is a superb track however best in the spring and summer months on a bike due to the lack of garages etc, but to ride it is one of the best.
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