They had £50,000 taken out on a banker's draft. Once they were warned, they moved the lot. The subsequent investigation showed that they'd moved it the day before the fraudsters were planning to go in and clean out the rest, which ran to well over half a million.
They got the money back, as it was clearly the bank's negligence in failing to check the details properly. But they were lastingly freaked out by the amount of personal information the fraudsters had amassed on them, including passports in both their names and details of their lives to the Nth degree.
I occasionally deal professionally with cases like this (not my friends', obviously) and would also suggest being v. careful and splitting large sums up between institutions.