LONDON (Reuters) -Britain’s budget deficit was bigger than expected in August as high inflation again bumped up interest accrued on government bonds, official data showed on Wednesday. The Office for National Statistics said public sector borrowing excluding state-owned banks stood at 11.82 billion pounds ($13.44 billion). A Reuters poll of economists had pointed to borrowing of 8.45 billion pounds for the shortfall in August. The pound dipped on the news and briefly touched $1.1349, its lowest against the U.S. dollar since 1985. The ONS recorded debt interest payable of 8.2 billion pounds in …