At 8.30pm on Sunday 15the February 2015 two men robbed the BP petrol station in Bourne End near High Wycombe.
The men made forecourt shop staff empty cash tills before leaving on foot with a quantity of cash.
The first suspect is described as white, in his twenties and was wearing a dark scarf which was wrapped around his nose and mouth. He was also wearing blue denim jeans, black trainers with white trim and a blue coat with silver buttons which he wore with the hood up.
The second suspect, who guarded the door throughout the robbery, was wearing cream coloured trousers, brown shoes and a grey hat under the hood of a black coat.
Thames Valley Police are appealing for anyone with information about this incident, or who may have seen two men matching these descriptions, to contact investigating officer Det Con Kim Twaite, of High Wycombe CID, via the 24-hour enquiry line 101.
If you do not want to speak directly to the police you can contact the independent charity Crimestoppers anonymously on 0800 555 111. No personal details are taken, information is not traced or recorded and you will not go to court.