I don't know if this is relevant to you but the following is from the Silverstone website:
Parking at the circuit is permitted Friday, Saturday and Sunday with a circuit parking pass. Please note that owners of vehicles not displaying the correct parking pass will be subject to a fixed penalty fee. To make sure your journey is as quick as possible we do not recommend using a sat nav when approaching Silverstone. Instead follow the signposts that are situated on local roads and on the M1 and M40.
CIRCUIT CAR PARKING PRICES
3 Day – £65
Sunday – £50
Saturday – £25
Friday – £15
Car park passes are available subject to availability. One car park pass is allocated per four tickets booked. Please note failure to display a valid pass will result in a civil parking notice. Camping is not permitted in any of the car parks.
If you are travelling by motorbike, you will not be issued with a parking pass as motorbike parking is free of charge. Please continue to select this option in the booking process to help us manage parking at the event.
