Silverstone star Lewis Hamilton casts doubt on future

Lewis Hamilton has cast his future into doubt by dropping another hint that he could walk away from Formula One at the end of the season.

Hamilton, who toasted his fourth consecutive British Grand Prix victory by performing his now customary crowd-surfing celebration with his army of home supporters at Silverstone, has moved to within just one point of Sebastian Vettel in the race for the title.

The seismic 19-point swing, following a faultless display by Hamilton and Vettel’s late puncture, leaves him back on track to become the first Briton to win four world titles, and one, should he accomplish it, which may be his last.