London (CNN) — Shares in UK lender Metro Bank sank as much as 31% Thursday following a report that it was urgently seeking to raise funds to shore up its finances. The Financial Times reported that the bank was in talks with investors to raise £250 million ($303 million) in equity and £350 million ($424 million) in debt, citing people with knowledge of the plan. Metro Bank opened in 2010 as the first challenger to Britain’s major main street banks — including Lloyds (LYG), Barclays (BCS) and HSBC (HSBC) — in more than 100 years. It declined to comment on...