Safety recommendations made after an accident four years earlier had not been applied at Dover Regatta where two powerboats collided, killing a Medway man, according to investigators.

The race at Dover in August last year was taking place on a shortened and compromised course, under confusing rules and without the risks being properly assessed, investigators have found.

However, the report by the Marine Accident Investigation Branch, said the course had been approved by the Royal Yachting Association, and a large proportion of untrained novice and inexperienced competitors were permitted to take part.

"Ultimately it was the ability of the crews of the two boats that collided that caused the collision," said the investigation team.

But, they said, they were racing under the auspices of an organisation that the investigation concluded had been insufficiently focused on safety and had not made adequate attempts to control the race or educate the crews about the risks they faced."

The accident involved two offshore circuit racing powerboats Sleepwalker and Harwich 2011.

The man who died was Alex Edmonds, 41, who lived at Grain Road, Lower Stoke, and was a member of Allhallows Yacht Club.

Both crews were said to have limited racing experience but were taking part in the RYA’s national championship. The investigators said it was on a course that was too short and was congested by the number of boats in the race.

The collision happened when Harwich 2011 unintentionally lost control, turned sharply and reduced speed significantly. The crew of Sleepwalker, which was following behind, had little opportunity to take avoiding action and struck the side of the first boat close to where its co-driver, Mr Edmonds, was seated. He bore much of the force of the impact, his helmet was torn off and he suffered severe injuries to his head and upper body.

Despite prompt and extensive medical attention, Mr Edmonds, who had a young daughter, died.

The MAIB said that safety lessons, identified from an accident at Portland Harbour in June 2005, had not been applied effectively as intended by the RYA Council.

Mr Edmonds' parents Ron and Josephine, who also live in Lower Stoke, said today they did not wish to comment on the report.