What’s the Fastest Race Track in the UK?

Which of these three race tracks in the UK claims to be the fastest? Silverstone, Brands Hatch or Thruxton?

According to their own website, Thruxton claims to be the fastest circuit in the UK. The Thruxton circuit, located in Hampshire, England is around 2.3 miles long with 11 corners.

Among other events the track is currently used for the British Touring Car Championship, British Superbikes, British F3 and the British GT racing series.