Meanwhile, Turnbull's training partner Mark Carroll produced a disappointing performance in Sunday's Flora London Marathon.

BBC: Turnbull's fitness battle

Former winner Charlie Spedding joins John Inverdale for Radio Five Live's coverage of the Flora London Marathon between 0830 and 1215, with commentary on the elite races from John Rawling, Mike Costello and Chicago Marathon winner Marion Sutton.

BBC: Marathon coverage at the

Tipton's Matt Smith and Belgrave's Birhan Dagne retained their titles in the Flora London Half Marathon at Silverstone.

BBC: SPORT | Athletics | Mason beats Morris on Merseyside