The researchers sent a questionnaire to the senior nurse manager of every major accident and emergency department in the UK. A total of 227 questionnaires from 261 departments were returned.

BBC: Hospitals 'unready' for chemical alert

But the bank, now known as BNY Mellon, told the BBC that, while Mr Secker had been a vice president there, he had actually worked in their IT department in foreign exchange operations, reporting to a senior manager there.

BBC: 'Get rich quick' seminars put to the test