Thanks all. Some good info to go on. Absolutely agree it's not how any same person would design a system.
I guess since all but towel radiators in bathrooms have TRVs then there isn't much flow up the pipes to the radiators from the main spine - we haven't noticed those radiators getting warm...
Thanks for the responses.
Boiler is a Glow-worm Ultimate (80FF) boiler of unknown (but certainly getting on a bit) vintage.
The pump is on the flow side of the boiler, next to it.
Ah, good spot, thank you. My diagram was not quite correct - I have edited and corrected. The F+E tank is plumbed as per the updated diagram. So yes plumbed to the far side of the 3-port valve, with either the valve or a radiator between it and the boiler.
So we bought an old house, it's an odd shape (10 external walls versus your usual 4) due to various extensions. Since we moved in the central heating has been a bit of a mystery in terms of pipe routing, though I should have guessed it would be 'interesting' based on the fact that more...
Hello helpful people of the internet!
We have a cottage roof which gets narrower in a 'step' (apologies, probably explaining this terribly) about halfway down. The 'step' of about 60cm has a short run of guttering that abutts the lower section of roof. The presence of a rafter below getting...