Bradford motor cyclist David Brook made the most of a test day and major tweaks to his Arkoni Ltd ZX10 bike to improve his placings in the Thundersport GB Superstock at Donington Park.

The 27-year-old from Clayton Heights qualified ninth after altering his riding position and controls but had problems dealing with the greater power of his machine.

A poor start and heavy traffic contributed to a 12th-place finish in race one but, despite qualifying 11th in race two, he improved to seventh after bettering his lap times by two seconds.

In race three, Brook showed he has lost none of his ability to scrap for positions and finished eighth.