The robbery took place on Thursday 5 November at 2.43pm at Sangherea Stores, Woodfield Road, Princes Risborough.

A man entered the store, threatened the cashier with a knife and demanded a packet of cigerettes.

The cashier handed them over and the offender left.

The offender is white, approximatley 25-years-old, 5ft 8ins, medium build and had a rough sounding voice.

He has dark-coloured, untidy hair; dark-coloured eyes and a round tattoo on the right side of his neck, tattoos on his arm and a long scar on his left arm.

He was wearing a blue T-shirt, possibly a Birmingham City football shirt, jeans and shoes.

Police would like to hear from anyone who may know the identity of this man.

If you have any information about this incident, please contact Det Con Richard Bazeley at High Wycombe police station via the 24-hour non-emergency number, 0845 8 505 505. If you do not want to speak to the police, call the Crimestoppers charity anonymously on 0800 555 111.