The London stock market closed lower on Tuesday with the leading FTSE 100 index down by 22.68 points, or 0.4 percent, at 5,528.27 points. Banks were worst hi by rumors about Portugal's woes, with Barclays 2.6 percent and Royal Bank of Scotland 2.4 percent lower. Rising metals prices pushed miners Rio Tinto and BHP Biliton up 0.9 percent each, while energy firm Cairn rose 2.4 percent on the award of new exploration licenses. 