i used to clean 15 post offices in and around my area.my boss cleaned them for a cleaning company based in SCOTLAND and i beileve they have the contract for all the genaral post offices in the country.but only the big genarals not the local smaller ones.they were cleaned ever week and i got the impression that he was on a good number for them.but they were a nightmere a-far as parking on main road.when cleaning around back we always was given parking tickets thats with pipes running around building and the pump running+hazzards on.come back to van after finnished ticket there and never a traffic warden in sight .think they used to wait till we had gone out of view then get us.total pain.