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Hello, I need to know how to turn off the power of my building. Please can I have help? Thanks

Hi there, I have got an unvented water tank in my new house and had all the radiators replaced for before I moved in. It was tested by the installers by turning the heating on and all the radiators worked fine. But after I moved in, I just found out that while only hot water is on, some of the radiators are on too. Anyone knows what may cause that? I ordered the radiators from an online shop and when they were delivered there stickers with 'inlet' 'outlet' on the radiators which the installer didn't always follow. I was told by the supplier that the installer needed to change something inside of the radiator to change the inlet side to outlet. But the installer said that was okay. Will it be the possible reason for that? Many many thanks

100 year old house. Has 2 plaster layers. inside Plaster 2cm thick and in good condition. Outside Plaster 1cm thick has debonded and peeling off. possibly causing damp issues inside. Advice needed if silicone rendering can be applied on top as finishing layer or what would be the best solution for second layer.