Investigators are on the trail of a global scam that has conned a series of NHS hospitals out of over £12.5 million, and a hospital cashier leads the high life - taking money meant for patients and putting it in to her own bank account.

A locksmith sees pound signs when he is put in charge of a London hospital - and pockets nearly half a million pounds by overcharging the hospital for supplies. Elsewhere, an NHS manager dreams up a scam to siphon over £800,000 of NHS money into his own account.

Investigators uncover an abuse of public money when an NHS manager and his friends conspire to take a quarter of a million pounds - money meant to pay for dialysis equipment for patients. Plus the case of a man who for six years claimed the NHS pension of his dead aunt.

An accounts worker siphons £642,000 of NHS money into personal bank accounts, and a GP practice manager fakes emails to award himself a pay rise.