Prisons across the country have spent more than £330,000 changing their locks after their keys were lost, new figures have revealed.
According to the Ministry of Justice, four prisons have spent £337,551 replacing their locks after the keys went missing since the last general election in May 2010.
The four prisons are Swaleside on the the Isle of Sheppey, Kent, Glen Parva in Leicestershire, Warren Hill in Suffolk and Birmingham prison, Justice Minister Helen Grant said in a written parliamentary answer.
She said G4S, which operates Birmingham prison, paid for the locks to be changed in that case.
The costs were revealed after a written parliamentary question from shadow justice minister Sadiq Khan.