Barclays has reported record investment banking revenue of £4.1 billion for the first half of the year, driven by a surge in dealmaking and capital markets activity that underscores the City of London's continued relevance as a global financial hub.

The results were propelled by a wave of M&A advisory mandates, equity underwriting for tech IPOs, and strong fixed-income trading. The bank's return on equity in its investment division reached 15.2 per cent — comfortably above its cost of capital for the first time in three years.

"The City is back," declared the Barclays CEO. "The narrative of London's decline as a financial centre has been thoroughly disproven by these results."

Shares in Barclays rose 6 per cent on the announcement, with analysts at Morgan Stanley upgrading the stock to 'overweight' and raising their price target by 20 per cent.