Police now have footage of two suspects who they believe conned a couple into giving them their bank card.
Early in May an older couple from Crawley received a call on their landline from a man who claimed to be an officer from Hammersmith Police station.
The officer told the victim they had arrested someone in London for an alleged card fraud.
The victim thought he was put through to his banks to cancel the cards and then arranged for them to be picked up by the fake police officer. He gave his pin numbers to what he believed to be his bank.
The cards were then collected by taxi and used at Ibis Hotel on Romford Road in Stratford, London.
They were used again 5 minutes later at a cash machine on Bow Road.
The two men withdrew around £350 in cash.
Police only have basic descriptions of the suspects who they say are between 18 and 25, Asian and slim.
Detective constable Glenn Fisk says this type of fraud is common nowadays and warns that banks and police will never ask for bank card pin numbers.