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Is it possible to run a 110m soil pipe under the bath against the wall and one side of the bath

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

Long story short We recently bought a house and had some work done on our roof and we discovered that our chimney has 3 big holes / open flues at the top which are going to get capped in the next few days but we had a massive downpour last Sunday and I could hear water dripping in the chimney breast and water started to drip from ceiling in our downstairs living room just where the chimney breast is and the wall + skirting boards in the bedrooms upstairs against the chimney breasts have high readings (bought a pinless damp meter reading to check) I’m worried about the skirting boards ! Anything I need to do once the chimney is capped ? will it all dry itself or will it be more likely to rot ? I’m not sure how long it’s been like that as only discovered that when started having drips in the downstair’s room