Adam Morgan topped a rain-affected opening Dunlop MSA British Touring Car Championship free practice session at Silverstone.
The Ciceley Racing man set his best time during the early laps in drier conditions at the shorter national circuit in Northamptonshire, before a downpour meant drivers struggled to improve times in the remainder of the 40-minute encounter.
The Mercedes A-Class lapped the circuit in a time of 1m03.540s, an effort that proved 0.822s quicker than nearest rival, AmD Tuning‘s Ollie Jackson.
Mat Jackson was next up in his re-liveried Motorbase Performance Ford Focus ST, the top five rounded out by Speedworks Motorsport‘s Matt Simpson and Team HARD‘s Jake Hill.
Another Toyota Avensis was next up in the hands of Simpson’s Speedworks team-mate, Tom Ingram, Stewart Lines seventh thanks to an earlier effort in the drier conditions.
Ashley Sutton (MG), Rob Austin (Toyota) and Matt Neal (Honda) rounded out the top 10, championship leader Sam Tordoff ending 14th overall for West Surrey Racing.
“I’d like it to be dry in qualifying”, Tordoff said afterwards. “First practice went well and we’re happy with the car at the moment.”
Subaru’s Jason Plato and Ford’s Andrew Jordan propped up the times meanwhile, having set eight and six laps late on respectively.