Lewis Hamilton's brilliant win at Silverstone – his first British GP victory – sees him tied at the top with Felipe Massa and Kimi Raikkonen on 48 points with Robert Kubica only two points adrift.
The layers have wasted no time in cutting Hamilton from 7-2 to 7-4 with nine races to go.
Raikkonen has eased from evens to 11-8, while Massa, who led the standings prior to Silverstone, showed he can not cope with wet weather and pirouetted all the way to 13th and last place.
Massa has taken a walk in the market out to 4-1 while Kubica is a generous each-way bet at 22-1 as he would have taken the lead in the title race if he had finished no worse that sixth.
The Iceman Raikkonen still remains the call to retain his crown as his luck is bound to improve after failing in Monaco and Canada and losing out in France when an exhaust problem cost him dear.
Raikkonen cost Boylesports plenty in their concessionary bets.
The Dundalk firm returned £50,000 in losing bets on the race winner after the Finn failed to finish on the podium.