Having seen Red Bull’s Pierre Gasly mount a late charge for top spot in the morning session on Friday, this time Bottas secured bragging rights at Silverstone.
The Finn was the quickest of the two Silver Arrows but by the narrowest of margins, finishing FP2 just 0.069seconds ahead of history-chasing partner Hamilton.
It wasn’t exactly a clean run for Hamilton, though, with the five-time champion a tad fortunate to avoid damaging his Mercedes after spinning off track.
Mercedes’ nearest rivals were Ferrari, still without a victory this season, with Charles Leclerc’s quickest time – just tenths of a second slower than the pace-setter – suggesting the Italians have pace here at Silverstone.
In a further boost for the famous Scuderia, four-time world champion Sebastian Vettel brought his red challenger home in fourth ahead of Gasly.
The award for the stand-out performance of the afternoon surely goes to British teenager Lando Norris, who finished in a stunning sixth place for McLaren.
The 19-year-old was impressively ahead of Austrian Grand Prix winner Max Verstappen, the Dutchman who has been tipped to challenge Hamilton for victory this weekend.
Norris’ fellow British rookie endured a tough session, however, and finished rock-bottom behind his struggling Williams team-mate Robert Kubica.
The day’s two results – with Red Bull and Mercedes sharing top spot – leave it finely poised going into Saturday’s final practice session and qualifying.