British prime minister David Cameron has used a business breakfast in Sydney to promote investment in Britain.

Mr Cameron arrived in Australia this morning ahead of the G20 Leaders' Summit in Brisbane at the weekend.

He told the audience he felt it was a better re-election ploy for him to address a business function in Sydney than to don lycra and go on a bike ride with Australian Prime Minister Tony Abbott.

"I was going to start the day with a run with Tony Abbott but I thought he might go a bit fast," he said.

"Then he talked about a bicycle ride but I thought that that might involve wearing more lycra than is consistent with seeking re-election".

Oh I hope that is true for Australia also.