Japan has warned Britain that its exit from the European Union could prompt Japanese financial institutions to relocate from London and listed a raft of concerns from Japanese companies about the transition away from the EU.

In a 15-page report published on the eve of a summit of the Group of 20 major economies in China, a Japanese government task force formed to respond to the British exit also warned of a possible outflow of drug research and development investment from Britain, though it said it expects the British government to handle its departure from the bloc smoothly.

Recent economic data suggests the economic impact of Britain's vote to leave the EU has not been as severe as some predicted, although British Prime Minister Theresa May said Sunday its economy will suffer as a result of the decision.