Barclays shares fell 3.5pc on the news that bank chief Bob Diamond had resigned this morning but within half-an-hour  trading was up 1.8pc.

Mr Diamond was said to feel he had been “hounded out” by politicians who would have tied him up in inquiries and giving him no time to fix the bank.

The government has launched an all-party inquiry into the banking industry amidst the outcry over the rigging of Libor.

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