Jamie Dimon, second left, and George Osborne with JP Morgan staff in Bournemouth at a Remain campaign event in June

Jamie Dimon, the chief executive of JP Morgan, has repeated his warning that he could move thousands of jobs out of the UK in spite of a pledge yesterday by his deputy to help London retain its position as the world’s leading financial centre.

Viswas Raghavan, the bank’s deputy chief executive and head of investment banking in Europe, was one of five senior London bankers who met the chancellor yesterday and promised to support the capital.

Hours earlier, however, Mr Dimon threatened to export jobs to the Continent. “The worst case is that we might have to relocate a few thousand people to other offices in the eurozone,” he told Il Sole 24 Ore, the Italian newspaper.

Like many banks with big London operations,