The incident took place yesterday morning.
Two men have robbed a petrol station in Hathersage.
A dark blue Mercedes drove onto the forecourt of the Spa at about 9.10am on Tuesday, October 1 and then drove to the car park at the back.
Two men got out and went into the office cabin at the back of the petrol station. One was holding a screwdriver and the other was holding a knife. They threatened a member of staff before taking cash and driving off toward Sheffield.
The man holding the knife is described as being in his late 30s or early 40s and around 6ft tall. He wore grey tracksuit bottoms and a blue tracksuit top.
The man with the screwdriver is in his 20s, about 5ft 10ins tall and slim. He wore all black. They are both white and had balaclavas over their faces.