Plot: Richard Hammond gets behind the wheel of the mid-engined Alfa Romeo 4C on the shores of Lake Como in Italy - but his enjoyment of the lightweight vehicle is disturbed by the arrival of Jeremy Clarkson, who demands a race against his quad bike. Jeremy also visits Belgium, putting the McLaren P1 hypercar to the test in Bruges and around the Spa-Francorchamps Formula One circuit - and its combined power output of more than 900bhp generated from electricity and turbocharged petrol V8 power is likely to cause astonishment