Sutton pipped Dan Cammish, his stablemate in the line-up of NAPA-liveried Motorbase Ford Focuses, by 0.015 seconds with a time set during the morning of the second day of running on Wednesday.
Twelve of the top 13 set their best times across the two days during this session, and Sutton was one of those trialling a new soft-compound Goodyear as the BTCC gears up for the return of option tyres in 2023.
