Trainer Eve Johnson Houghton is the latest trainer to come forward and reveal one of her horses has tested positive for morphine.

Camelot faces his moment of truth in the Qipco 2000 Guineas at Newmarket this afternoon.

Channel 4 will show all terrestrial racing – including the Grand National, Royal Ascot and the Epsom Derby – for “at least the next four years” from 2013.

Rachel Hood, the new president of the Racehorse Owners' Association, has called for a drastic overhaul of the fixture list and the creation of three tiers for the sport.