I don't know if this counts strictly as a shop but I used to live and work in a three story building that consisted of the ground floor chip shop, first floor Bistro and top floor flat that was haunted.
It was originally a flour mill. An old bloke who also worked there past retirement age and part time (and had worked there as a young lad when it was the mill) refused to ever go in the top floor toilet because he said the room was haunted. I'd ran a romantic bath for my then girlfriend, candles, music etc, there was no draft in the room but we watched candle flames briefly burn sideways, windows and the door closed ... all of us heard the heavy wooden furniture being dragged across the floor in the locked Bistro one night despite the room being carpeted and the room being empty, things would switch themselves on an off, we had the feeling we were being watched often and would turn around to speak to each other to find no one was there, sudden temperature and mood drops and the light sound of a woman's footsteps, we'd smell flowers or perfume .. loads of weird stuff. The Bistro's kitchen door had a window in it, one night I walked past and thought I saw my mate's Dad lit up in the dark kitchen by the wall mounted fly zapper. When I went in to ask him what he was doing, there was nobody there. I remember seeing the elderly gentleman in profile, very much like King George the 3rd looks like on an old coin.
One night I'd had an unsettling dream there: I was walking up a hill towards a car parked at the top, the back door was open and their was a plastic bag on the back seat. I opened the bag and it contained a dead baby. When I told my girlfriend about this, she decided she'd had enough and being a local girl, she asked around about the building. She discovered that the place had been a similar business in the early 60's, chip shop, cafe and private flats run by a husband and wife. They'd hired a young woman to work their but he'd had a secret affair with her. His wife found out, got in her car, drove to the top of nearby hill and killed herself. She was pregnant but hadn't told her husband.
Myself, Mike and Jez had already realised the ghost was female when we were decorating the Bistro and building the bar. We'd become used to her and felt she was watching over us. We thanked her when the room was ready and left a drink on the bar for her.
Again, I don't know if that counts as a shop. This all happened in Oakham, Leister. The place is a financial advisors now as far as I can see from Google streetview.
Ironically, even though I go on ghost investigations these days, The Catmose Fish Bar in Oakham in '97 remains the most haunted place I've ever been. I'd love to do an investigation there nowadays.
https://www.instantstreetview.com/@52.669333,-0.72679,97h,-9.31p,1z