Detectives are urging a potential witness to an armed bank robbery to come forward.

They are hoping to track down a woman who they believe witnessed a man escape in a silver cabriolet car, with a black roof, following a raid at the Halifax bank in Sevenoaks High Street.

The crime happened shortly after 10.45am on Friday, February 7 and the woman is reported to have gone into the nearby Carphone Warehouse to ask for a piece of paper to write down the registration number of the vehicle.

The robber was wearing a hooded top under a jumper and also wore black and red gloves.

He threatened staff with a black handgun and escaped with a sum of money.

He was last seen being driven erratically through Sevenoaks towards London Road and staff were left shaken and traumatised.

Detective Constable Don Share from the Kent and Essex Serious Crime Directorate explained: “We are very keen to speak to this woman as we believe she could provide some key information in terms of identifying the vehicle and the offender.

“It is likely that she took note of some or all of the registration plate of the car and I would appeal for her to make contact with any information that she might have.”

Officers are also keen to speak to any witnesses who may have seen the male with the silver vehicle in the Locks Yard area by the bus station earlier that morning prior to the raid.

Anyone with any information is asked to contact DC Share by calling 01303 289353.

Alternatively, contact Kent Crimestoppers, anonymously, on 0800 555 111, quoting incident reference 07-0466.