"I hope in future they (don't)". "I think yesterday I really did struggle with it on a single lap and tried to improve it throughout the evening and into today".
"We found the answers we were looking for", said the German.
"It's good to get a good lap and get pole", Bottas told the Silverstone crowd after the chequered flag.
Silverstone - Lewis Hamilton brushed off questions about his lifestyle and heaped praise on his Mercedes team-mate Valtteri Bottas after the Finn had beaten him on Saturday to pole position for the British Grand Prix.
It then looked like Leclerc was primed to claim pole, but the Ferrari star also came up narrowly short and said on team radio he had made a mistake at the last corner.
"No matter how often that you go overseas or elsewhere in the world you come back to the United Kingdom, see the countryside, and this great history of Formula One and motorsport and I see all my family who are also here and this feels where my heart is". As they go 007 style alongside the Aston Martin DB5.
"I think it is clear on paper that we are missing a bit of downforce compared to Mercedes in particular, hence the difference down the straight", Vettel added. "All those sweet spots don't always work at each track - but this has been a strong track for us in the past".
Red Bull won its first race in partnership with Honda last time out in Austria, and has enjoyed a largely competitive weekend at Silverstone despite much cooler conditions and different track characteristics.
But Ferrari and Red Bull's resurgence and Mercedes' underwhelming display was likely triggered by a ideal storm of hot temperatures and track layout, rather than signalling a more permanent change in the form book. Gasly finished seventh and lapped by his team mate in Austria and is under-pressure to perform.
McLaren's Lando Norris was sixth in the second session, another impressive performance from a 19-year-old fast becoming a fan favourite. Past year at Silverstone, Nico Hulkenberg finished fifth while Carlos Sainz was on track for points until being involved in a late crash. Romain Grosjean provided an immediate talking point by crashing his Haas in the pit lane exit, smashing the car's front wing.