The first round of the European Le Mans Series is a double-header at Silverstone with the first round of the World Endurance Championship being tomorrow/Sunday.
Race start: 14:30hrs BST Saturday 11th April.
Race finish: 18:30hrs
This will be available here
http://www.europeanlemansseries.com/en/here
European Le Mans Series - Dailymotionand on Motors TV free-to-air on Freeview/YouView channel 71 or 240. See here
MOTORS TV: NOW AVAILABLE ON FREEVIEW/YOUVIEW CHANNEL 71 | Motors TVon how to receive for free.
I know for a fact that the Freeview service is available in the Bristol and London reception areas with the appropriate tuner/set-top box.