Commercial property loans continue to fester for Lloyds Banking Group, which reported a doubling in impaired loans in Australia over the course of 2010.Impaired loans in Australia increased by £2.2 billion to £4.2 billion over the year, results published on Friday in London show.The ratio of impaired loans to total loans in Australia increased to 28.7 per cent at the end of 2010 compared with 14.4 per cent at the end of 2009.The impairment charge increased by £510 million, to £1.4 billion, over the year, the bank said. Lloyds recognised two-thirds of the impairment charge in the second half of the year.              In its financial review, the bank cited "a significant reduction in liquidity [in commercial property] in 2010" in spite of what the bank acknowledged was a "more robust" Australian economy.The bank also referred to "sector variations" and said "property assets situated outside the principal metropolitan areas have been particularly weak."