The Bank of England said on Tuesday that risks around Britain's referendum on the European Union could push up borrowing costs and weaken sterling, and tightened rules for mortgage lending to landlords. The central bank said the outlook for financial stability had worsened since its last quarterly report in November, and also moved ahead with plans to require some banks to hold extra capital as lending growth started to pick up. "The outlook for financial stability in the United Kingdom has deteriorated," the BoE's Financial Policy Committee said. "Domestic risks have been supplemented by risks around the EU ... (full story)