The 74-year-old came out in force to oppose the new fracking licenses which are being pushed through parts of northern England.
Westwood said: "Cameron accuses foreign leaders such as President Gaddafi and President Assad of supposedly using chemicals on their own people as a justification for regime change. But he is doing precisely that here in Britain by forcing toxic, life-threatening fracking chemicals on his own people against the advice of his own chief scientist.
"It's time for regime change in Britain. Cameron plans to force householders to surrender their land and endure fracking underneath their homes. Britons no longer have any choice but to fight back."