The Double Sculls Challenge Cup is a rowing event for men's double sculls at the annual Henley Royal Regatta on the River Thames at Henley-on-Thames in England. GB coxless pair of Toby Garbett & Rick Dunn at Henley Royal Regatta 2004 Henley Royal Regatta is a rowing event held every year on the River Thames by the town of Henley-on-Thames, England. The Thames ( is a major River flowing through southern England. Henley-on-Thames is a town on the north side of the River Thames in south Oxfordshire, England, about 10 miles downstream and north-east from England is a Country which is part of the United Kingdom. Its inhabitants account for more than 83% of the total UK population whilst its mainland It is open to male crews from all eligible rowing clubs. A rowing club is a Club for people interested in the Sport of Rowing. Two clubs may combine to make an entry.