Non sealed-system combis?

[livingstoned]

If you intend to keep the bath, a combi will be severely disappointing after using that pump with a HW cylinder.

Yeah, not too bovvered though. It takes me quarter of an hour to get me togs off these days so I'll be in sync.

My airing cupboard, includes a removable timber panel, to allow access - could you do something similar?

The pump's against the outside wall...
I can't get to the screws on the pump to take the head off, and it's a Myson Unit3, I don't know if anything would fit.

I managed to reach in and put cuts in the pump nuts with a junior eclipse, so I should be able to split the nuts off if I belt it with something. Whatever happens the pump has to come out. I have serious doubts I can get a new one in. Maybe, with rubber washers and a smear of LS-X it won't have to be too tight. I need a scrawny plumber to reach in.

The best wrench I know of is this type..... https://monumenthandtools.co.uk/mon...al-adjustable-basin-wrench-15-to-42mm-mon349h
Mine was £12 I think.

I used to have a 2 1/16th crowfoot spanner. I can't find it yet but I have a 2" I could grind out, at a pinch.
The nuts cut quite easily, but I had to phone the wife to come and help me get up again.