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Indeed, Geoff, most of my apprenticeship was in such building(s) and Lighthouse(s). Like you, marvelled at the work don't previously...

I'll bet that is a brick wall and the new heater was too big and could not be bothered for the mess of moving it. Oh how I hate brick...

Amen to that, the apprentice years of chapping out bricks/concrete blocks to fit boxes and channels with feather cutters and 'dooking'...