The Hollywood moviemaker was among 400 protesters who gathered in Watsons Bay to voice opposition to proposals to transform six historic buildings into wedding venues, hotels and conference centres.

George is a vocal opponent of the development and has even released a short film condemning the plans.

During the protest on Thursday, he and his colleague Ben Osmo set up a sound system and blasted audio from weddings across the area, with the director telling the crowd, "That gives you an idea of what you can expect," according to the Sydney Daily Telegraph.

"We simply have to stop it, the more we dig into this thing the more concerning it is," he said. "It's not just about this peninsula, it's not just about the eastern suburbs, it's about the whole country... This is Australia's heritage, now there is an attempt to completely disregard it."

Protesters argue the proposals will bring noise, disruption and extra traffic to the suburban area.

In his short film, which was released this week (beg12Oct15), George said of the project, "This is such a special place, of such significance to all Australian people... This was the land of the Gadigal people (Aboriginal Australians)... right here in 1788 is where captain Arthur Phillip (who first set up Sydney as a penal colony in 1788) first landed.

"This unique peninsula is now under threat from the very agency meant to protect it, the Office of Environment and Heritage."