MJNewton

It should be the same matting on all joins - both surface and upstands etc. For the upstands and wall abutment our roofer put down some pre-formed bends (of rigid fibreglass?) too but I think that was as an alternative to wooden angle fillets that you might normally see. I don't know if there's a benefit to this (e.g. more gradual angle transition) or whether it was just quicker/easier for him (probably the latter knowing him).

Yeah, all good as far as I know! It's been down five years now (where does the time go?!).

For what it's worth, my BCO didn't ask for anything.

I was just going to say that even if it was counter intuitive you'd soon get used to it, but yes - it is exactly the sort of thing that keeps me awake at night in the planning stages!!

Perhaps a little on the short side? More seriously, might there be benefit in hanging it on the other side so as to match the machine opening itself? Probably doesn't matter much either way, but I'm just thinking of it might have you a little more space when loading/unloading.

Put the heating on max and watch what happens. The pressure increase without expansion capacity will happen without having to wait too long.

Does the PRV outlet show any signs of passing?

As the water heats and expands in the sealed system it'll increase in pressure and cause the PRV to open. This loss of water will result in pressure loss once cooled.

So, you've found the issue. From what you've written it sounds like you're still looking though?

Yes - completely agree. Furthermore, if it stops further ingress of water that can only be a good thing whilst the decision is made what to do next.

Yes, entirely normal. After about 1/2-3/4 turns most LSVs are for all intents and propose fully open. Because of this only small adjustments should/can be made.

Flow should be the hottest, and Return coolest. How that correlates to the TRV and LSV depends on which way round they have been fitted. TRVs used to be directional - and hence would be located at the Flow end - but these days non chattering valve inserts are generally used thus making them bidirectional. Whether new or old you will have to work out which way round each of yours are by measuring the temperatures as you have been doing. Not that it matters too much for balancing - it will always be the LSV that you will be adjusting regardless which end of the radiator it has been put.

Whilst MVHR might help with heat-related 'stuffiness', it won't do much for the heat itself. The combination of the low heat capacity of air and the relatively low flow rates means it is not a good solution.

Yeah, bought one about a year ago. Still haven't used it!!

That sort of thing doesn't bother me. It HAUNTS me!! 😂