The boss of JPMorgan Chase approved plans for a new £3bn tower in London after a senior adviser to the UK prime minister travelled to New York to reassure the bank over the government’s pro-business stance, it has emerged.

The Wall Street bank, which along with Goldman Sachs announced substantial investment plans in the UK hours after they were spared tax increases in Rachel Reeves’s autumn budget, only signed off on the plan for its new UK headquarters last Friday.

This followed a trip to the US by Varun Chandra, Keir Starmer’s business envoy, to meet Jamie Dimon, the chair and chief executive of JPMorgan Chase, according to the Financial Times.

The visit came days before the chancellor announced £26bn in tax rises in a budget that did not impose higher levies on banks, after furi

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