Friday's Ferrari

Ferrari uses the Corse Clienti Ferrari Racing Days meetings at various circuits to allow a group of specially selected customers to test limited edition cars developed exclusively for the track and to provide feedback on the performance of the cars to Corse Clienti engineers, thus helping Ferrari to develop its cars for the future. The Ferrari Racing Days meeting at Silverstone in September 2017 included a series of test sessions involving the Ferrari FXX-K, the 'K' referring to the KERS kinetic energy recovery system with which the car is equipped. Here's one of the cars pictured at Club Corner during one of the sessions.

This is Russian driver Valentin Bukhtoyarov in his Ferrari FXX-K, which is based on the LaFerrari. The car has a 6,262cc V12 engine that develops 848 hp, to which the 140kW electric motor adds 188 hp.