But Bottas found ample grip on the outside and clung on, edging Hamilton wide at Luffield.
Approaching the super-fast Copse Bottas swung to the inside and Hamilton, showing perhaps an excess of fairness to his team mate, ceded the inside line.
Bottas was quick enough on the short straight to claim the corner, obliging Hamilton to accept second place.
But Hamilton, who had turned down the option of an extra pit stop for softs to cover Bottas, liked the feel of his hard tyres.
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