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Post a picture or two we can advise you better I would recommend removed the plasterboard and fix a strip of ply 22mm at least plugged and...
Hopefully it's a untrapped waste but best to make sure Charlie . Kop
Call a GSI in to investigate to be on the safe side . Kop
As above you will need to store that water and pump from there , temporary tanks linked together maybe and pumped . Kop
Time for a service Mr dog
Pro rad are a lower end budget radiator, Stelrad or Purmo are alot better. Kop
Why would you just heat the buffer up and switch everything off ? the temperature in the buffer will loose a few degrees a day it really depends...
It cant the boiler needs to fire to raise the temperature in the buffer tank once the temperature drops, some form of renewable energy...
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