A group of actors performed a song from the hit musical "Oliver" to mock British Prime Minister David Cameron, outside the venue of an anti-corruption summit in London yesterday.

The group sang "Pick a Pocket or Two" from the musical, based on Charles Dickens' Oliver Twist.

"In this life one thing counts. In the bank, large amounts. I am afraid these don't grow on trees," they sang in chorus.

"Why should we break our backs, stupidly paying tax," the actors sang, as they waved wads of currency notes in front of another actor wearing a mask of Cameron.

Cameron published his tax records last month to try to end days of questions about his personal wealth raised by the mention of his late father's offshore fund in the Panama Papers detailing activities of Panama law firm Mossack Fonseca.

Cameron on Thursday pledged to set up a public register to show who owns properties in Britain, in an effort to stop stolen funds being laundered through London's property market.

Cameron is one of dozens of politicians around the world who have been hit by the leak of 11.5 million documents from Mossack Fonseca that detail the creation of more than 200,000 companies in offshore tax havens.