Staff at the Muswell Hill branch in north London had forgotten to lock up on Maundy Thursday before the bank holiday. A customer pleased to find a bank open on a public holiday was puzzled by the open-door policy. Finding that no-one was behind the counter and the branch was deserted, she rang the police.
Barclays said the incident was unfortunate and a full review of security at the branch would be carried out. A spokeswoman said: "Thankfully, no money was taken."