JPMorgan has asked around 50% of its London dealmaking teams to return to the office, marking the latest step in the US financial giant’s efforts to increase the numbers returning to its Canary Wharf headquarters. 

The US bank, which has been gradually increasing the number of London-based staff since reopening its doors in July, has around half of its investment bankers back in the office from 7 September, according to a person familiar with the matter.