And 15-year-old James didn't stop there, adding the European Championship crown in his class with victory in Medemblik in Holland a week after his Danish triumph with partner Ed Fitzgerald from Chichester.

In Denmark, Frances - sailing with Claire Lasko - grabbed the girls' 29er title helping, Britain to a final tally of two golds and one bronze to put them top of the medal table ahead of Cyprus and Australia, to claim them Volvo Trophy.

The girls picked up an excellent five wins and four seconds from their first 14 races.

Frances, who like her brother is a member of Hayling Island Sailing Club, said: "It hasn't sunk in yet. It is a relief because this is what we have been working towards for so long.

"Seven hour sessions out on the water in December have finally paid off and it is all worthwhile now. This is why we did it and worked so hard.

Brother James had to wait until the jury had returned a disqualification verdict against the Americans for a race 13 right of way infringement, protested by the French, until they could start to celebrate victory.

Royal Yachting Association youth manager Simon Wergan, had just one word for his team's show during the week – "stunning."

He said: "There is no doubt in my mind that there are some very special sailors in this group.

"The results of all the medal winners were outstanding but we have really sailed as a team here and when people have needed to post results to score us points in the Volvo Trophy standings, they went out and did it.

"It was not an easy regatta. There was unpredictable wind and current all week and the sailors dealt with it to the best of their abilities."

Of the gold-medal winning performances, Wergan said of James and Ed: "They finished 11 points ahead of the second-place crew in the end and were the class act all week.

"They were absolutely stunning and have sailed with a maturity well beyond their youth."

He was equally impressed with the girls in the 29ers. Wergan added: "Frances and Claire sailed terrifically well and were thoroughly professional in everything they did all week.

"They were a class act on and off the water, likewise the boys. Before the event we asked all the sailors to be very focussed and stick to their routines and at an event when there are a lot of distractions, they have all done that."

Britain last won the Volvo Trophy in 1996, having first claimed the top prize the previous year.

RYA performance director John Derbyshire said: "This is a really great result for British sailing.

"To have a brother and sister both winning gold in different boats is just incredible.

"However every team member scored points to contribute to the overall Volvo Trophy success and every one of them can be incredibly proud."

Peters and 16-year-old Fitzgerald won gold with a day to spare in Denmark and they carried that form to Medemblik where three wins in the series of nine handed them victory over British teammates Bleddyn Mon and Tom Humphries who claimed silver.