DR Lynn Hillyer, chief veterinary officer for the Irish Horseracing Regulatory Board, has agreed to chair an international veterinary working group which aims to produce more advice for trainers on the withdrawal times for the anti-inflammatory medication known as TCA.

This week trainer John Gosden lost a listed race and was fined £3,000 over the presence of the corticosteroid triamcinolone acetonide [TCA] in two post-race samples.