Rob Smedley has heaped praise on Valtteri Bottas following his display at the British GP, describing his performance as "exceptional".
With both Bottas and team-mate Felipe Massa knocked out in Q1 on the Saturday, Williams were facing an uphill battle on race day at Silverstone, but they were in for a big surprise.
First Bottas was bumped up to P14 on the grid following penalties to other drivers and then the Finn produced a master class to secure a career-best P2.
"Valterri did an exceptional job," Smedley, the Williams head of vehicle performance, told Autosport. "The communication between him and the pitwall was exceptional; you need that level of synergy between driver and pit and here it came off as well as it could do really.
"[But] we can't underestimate how much the [Mercedes] power unit has played in the result, because Valtteri was able to overtake cars, get past them very quickly and use the car's pace.
"If we weren't able to do that then the race would've had a completely different complexion."