The bank ended the day with a market capitalisation of about 27.01 billion pounds, down 9.5 percent from Wednesday, according to calculations. The stock had its worst day since the Brexit vote in June 2016.

UK housebuilders Taylor Wimpey, Barratt Development, Persimmon and Berkeley, which were some of the biggest fallers on the day, lost a combined 1.6 billion pounds.

Persimmon was hardest hit, losing 540 million pounds; Barratt lost about 430 million pounds, while Taylor Wimpey's market value fell by 380 million pounds and Berkeley's dropped by 290 million pounds.

(Reporting by Josephine Mason; Editing by Susan Fenton)