The profitability of Barclays Capital, the investment banking arm of Barclays, doubled in the first half of 2009 to £1.047bn but could not stop the group’s profit from missing expectations.

Barclays said on Monday that its interim pre-tax profits rose 8 per cent to £2.984bn. Analysts polled by Reuters had expected a profit of £3.5bn. Shares in the group jumped 6.2 per cent to 321p in afternoon trading, however.