Royal Bank of Scotland was the regulator's main cause of concern,
UK banks need to raise billions more in capital to cover their risks, according to the financial regulator.
The Prudential Regulation Authority (PRA) says Britain's top banks and building societies need to fill a £27.1bn hole in their balance sheets.
Royal Bank of Scotland was the regulator's main cause of concern, accounting for £13.6bn of the total.
Lloyds Banking Group accounts for £8.6bn and Barclays £3bn. Nationwide had a small shortfall of £400,000.
Co-operative Bank has already identified a £1.5bn hole in its finances and announced a bond-to-equity 'bail-in' plan to deal with the shortfall.
HSBC, Santander UK and Standard Chartered were given a clean bill of health by the regulator.
Source: BBC News - Business http://www.bbc.co.uk/news/business-22982311#sa-ns_mchannel=rss&ns_source=PublicRSS20-sa
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