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David Cameron was branded a sham yesterday for going to visit a green energy project - in a gas-guzzling helicopter.

The Tory leader travelled from London to Norwich and toured a lab which turned waste into biofuels.

A Green Party spokesman said: "Mr Cameron claims to be committed to working to reduce climate change but the least environmentally friendly travel is helicopter.

"And he was going to a university to discuss the development of environmentally friendly fuels."

Two years ago the Mirror revealed that as Mr Cameron cycled to work his chauffeur was taking his gear by car.

Mr Cameron, in the city six days before the Norwich North by-election, also upset university staff by refusing to be pictured in a lab coat.

His spokesman did not comment on the white coat but said: "We use different kinds of transport. The journeys are carbon offset."