I made a booking here a few years ago for 10am (probably the hottest booking slot of the day).
I arrived punctually and was told to wait in a room, the girl is "still on her way" and will be arriving "shortly". Well, 5 mins became 10 mins, which became 20 mins and before you know it, it was almost 10.30. Just then, I heard a door click at the end of the corridor, followed by some footsteps, and then the front door opened and closed. Moments after this, the girl comes into my waiting room.
So in other words, I had been double booked (probably on purpose). They know that (some) customers are unreliable and won't turn up to their booking, so they deliberately double-book in order to reduce the chance of girl down-time. Actually airlines do the same when selling seats. They know there will always be a no-show element and will try to factor it into their calculations to maximize bums on seats.
This is one of many reasons I stopped going there.
But I really do miss Shelly/Shirley. She was probably the hottest girl in the shop.