The German Club Tivoli in suburban Windsor scrapped plans to host two speeches by Lord Monckton on July 20 after learning he displayed a swastika next to Professor Garnaut's name and said ''Heil Hitler, on we go'' during a lecture in the US
German Club president Edmund Reichmann said the venue would not host a speaker who used Nazi imagery to attack a public figure unfairly.
''They said that he had apologised, but the apology is not accepted,'' he said. ''We can't accept any speaker under those circumstances.''
The attack on Professor Garnaut was not the first time Lord Monckton accused those he disagrees with of being Nazis.
In December 2009 he accused students who stormed the stage as he delivered a speech in Copenhagen of being ''Hitler Youth''.