I don't know what "Wimpey" is but Ladbrokes is a "Turf Accountant." (Bookie joint.) There really is nothing inside to steal except some stools and a few copies of the Sporting News. I doubt hairdressers have much worth stealing either but I've never visited one in London. This doesn't make sense to me.
ML/NJ
I just watched the footage again and it looks like they were pulling the flat screens off the wall at Ladbrokes. Wimpy is a burger place, by the way.