Officers were called after a man went into Ramshill Service Station between 3.50am ad 4.10am on June 26.
He threatened a member of staff with violence, ordering them to take money out of the till. He fled with £90 in cash.
Fortunately no one was injured.
Officers investigating the incident have released a CCTV of a man who they would like to speak to as he may have information about the robbery.
Do you remember seeing someone wearing these clothes in the area that morning?
If you have any information, please contact us on 101, quoting reference number
In an emergency, call 999.