Two men entered the Co-op store in Main Road, Walter’s Ash, at about 9.45pm on 31 October, threatened staff with a knife and forced them to open the till and hand over money.
The men then assaulted the manager of the shop when they were told that there was no money in the shop, punching him in the face, before leaving the shop.
The men were seen getting into a white vehicle and left the scene in the direction of Lacey Green. The men were both white and were wearing grey tops and black bottoms.
Anyone with information should contact Thames Valley Police via the 24-hour enquiry line on 0845 8 505 505. Alternatively, you can contact the Crimestoppers charity anonymously on 0800 555 111