Lewis Hamilton has vowed to come back from Formula 1's summer break better than ever after admitting that the last two races in Germany and Hungary have tested him to the limit.Problems during qualifying  – a brake disc failure at Hockenheim, which pitched his Mercedes into the barriers at high speed, followed by a fuel leak at the Hungaroring, causing a blaze that left the team working through the night to ready their spare car – have left Hamilton with it all to do on successive Sundays.Forced to start at the back of the field both times, he rose to the challenge with a brace of third-place finishes. This being Hamilton, however, he also seemed to find incident around...
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