as mentioned above listen to engine as they do use oil and have no oil warning light only pressure light so alot of cars were run with low oil which helps towards the chain issues which were more common to the s engine
also the thermastate housing is a weakness was plastic not to sure on the...
get a bit of cardboard fold in over a few times and put between door and linning at top hinge then close door it will bind and crank hinge hopefully enough to miss head when closing you need too feel some resistance for it too work or just buy a cranking bar is alot easier
there a national hickman door set the centre square you took out out sets toe and heal of door
to adjust them hinges you need a cranking bar cheap one below
https://www.clasohlson.com/uk/Door-Hinge-Adjuster/30-1526?gclid=EAIaIQobChMIwYqZ7qf52QIVg7gbCh3EFQHGEAQYASABEgIYrvD_BwE
you can crank them...
the new ones come with a expanding rubber strip that fills that void but we used to foam around window then add 25mm insulation to sides then board but looking you may get 50mm on there
not knowing the cost of that boiler or works involved i had a glowworm 35 combi fitted last year old boiler was in airing cupboard and wanted new one in loft
and that came to £1900 with new magna clean
ha the nasty ones are the ones that own them knowing full well there crapping in peoples gardens instead of getting litter trays and training them to use them:whistle: and when you say something to them there like so (y) never there fault
the only things i found that works is the water jet good for heron too
also carpet grippers where the menaces come over the fence and once you get rid of them the wild life seems to appear back in your garden