He and two student rowers tried to go to Mr Hill’s aid but could not find him in the dark. His body was discovered on March 8 without a life jacket on but Mr Butler insisted he had been wearing one. The father of three, from Leeds, was an experienced coach who moved to London in 2012 to work at Laytmer Upper School in Fulham.
The boat was examined by Steve Rushbrook, a deputy harbour-master, who found that despite an anomaly with the gear position, it was seaworthy and the bumper had been fixed.
The court heard the kill cord, which is attached to the driver and cuts the engine if they fall overboard, had not been attached to Mr Hill. Mr Rushbrook said it was in good condition.
Coroner Shirley Radcliffe ruled Mr Hill died of immersion in the water with heart disease a secondary factor. She said: “I believe it was an accident.”