But Prof David Elliott, co-director of the Energy and Environment Research Unit at the Open University, said a single barrage was "pretty hopeless" in energy provision terms as it would only produce power in two bursts during a 24-hour period.

BBC: Barrage 'fixation' claims group

The home side pressed forward and James did well to hold a powerful header by Graham and a fierce shot from Andi Weimann, while Elliott wasted a chance after a David Clarkson pass.

BBC: Watford 1-3 Bristol City

Kirk Jamison won both Supersport 600s, Lee Hill both Mini Twins, Paul Robinson and David Craig the 250 races and Davy Lemon and Josh Elliott won 125 events.

BBC: Michael Pearson