Hamilton and Bottas were separated by just 0.069 seconds at Silverstone, the Brit losing it into Chapel on what looked like being a likely fastest lap.
More encouraging for Hamilton was a long-run advantage over the Finn, although his numerous excursions off the track in both sessions suggest the Brit is still to truly get to grips with things.
Vettel won here last year, but the Scuderia still need to find greater pace through the twistier parts of the circuit, despite looking strong – as expected – in the flat-out first sector.
The Gasly comeback starts now
Gasly has had to deal with plenty this year as he has struggled to find top form at Red Bull, fighting off rumours that he could be replaced sooner rather than later.
The Frenchman topped FP1 thanks to a late fast run, but kept his efforts up in the second session as well, going quicker than Max Verstappen over a single lap.
Verstappen was another driver to see his flying effort curtailed by a trip beyond the track limits and the Dutchman also struggled to get his soft tyres turned on, giving Red Bull plenty to work on after their victory in Austria last time out.
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