Shortcut:
 
While driving the at the Silverstone track, about
halfway to the end of the track, you will notice
several grandstands on the left side of the road.
After the third or fourth in a row on the left, a
hotel will come into view. If you continue towards
the hotel, and don't make the turn, you will see 
a service road. Continue on that road, and it will
lead you back onto the main track. You will advance
several positions in the race if you do this 
correctly.