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Thanks folks.... It worked. The power of 'Tinernet discussion groups. More than halved the price I was about to be charged

I have ours (in the old house) wired to a PIR switch in the ceiling, so the mirror heater comes on for ten minutes whenever anyone goes into the bathroom. The PIR re-triggers if anyone is in there longer than ten minutes, keeping the heater on. This seems to work well, and is a lot better than the way we had it wired before, which was to the light (they are OK on lighting circuits, as they are only a few tens of watts). When it was on the light circuit we found that there were a lot of times in summer when we didn't turn the bathroom light on, so the mirror didn't demist. Now it works well all year around.

Send it to County Battery - they will do it for you for about the same price you can get the cells for. https://www.countybattery.co.uk/

Nick Here is the thread from ebuild Demister woes

Why can't you go below the joists ..? You will struggle to notch the tops.

https://www.thetapestore.co.uk/tapes-rules/tape-measures/tape-length/20m-65ft-tape-measures/lufkin-special-long-steel-tape-20m-66ft-ls20cme Lovely Lufkin tape, change from £20....

If use 2 metal tapes then you will square it mins. If as mentioned you use nails to mark the points it's a job you can do yourself very quickly and accurately in no time in any weather. We all love a bit of new tech but for this job a gd metal tape is the winner every time.

You've obviously never owned a German Shepherd .... we have bamboo and it's been sanded in one area where a nameless child dropped a soldering iron onto it and "didn't notice the burning smell..." Sanded out with 120 and 360 grit paper and recoated with the Ronseal Diamond Hard satin varnish and you need to look carefully to see the difference in the varnish as the burn isn't visible.

Dogs hmmm. I would want a trial for a couple of years. The issue I see with directly bonded bamboo is that if something doesn't work to get it back up again you will need the tenaciousness of someone demolishing an Eqyptian pyramid with hand tools. I could be wrong - have not tried it, but I have the impression @JSHarris thinks it is there to stay. The other alternative for Plan B is to have something ready to go on top if your bamboo fails, or get one that can be sanded back and refinished. Can strand woven bamboo be sanded? This is very much about 10-12 years time and how easy or not it is to bring back to as-new condition after those years of dog-abuse. People I know with umpteen dogs have tended to go for relatively-inexpensive laminate and replace every few years, by which time it is dog-tired ( !). Personally if I were putting something down to stay likely to get dogs galloping around it would be refinishable multiple times or hard tiles such as porcelain or quarry. That will have thicker dogs such as red setters skating around like toddlers on ice, but should outlast them. Ferdinand

You will probably get 50-60 years out of them, but you might see the rust staining before that. That's how bodgit and scarper roofers would do it

Oh I've quoted projects and been £10K / £20K + more expensive than others. Its not til you sit down are able to compare competitors quotes you can see the difference. One particular one springs to mind of a 6.6 metre lift and slide door one fixed, one slide at 3m height, ours was double the price but it's not til you look at the details you realise the difference. Triple glazed you are looking at half a tonne + for the sliding element. Standard gearing doesn't cut the mustard so needs to be double gearing/electrical assistance. It was also a 90 degree corner and I worked out a specific detail for the corner which coupled to a standard fixed window. You can't just couple a 92mm frame to a 217mm frame on a corner detail. Its only when you look at these things you see why.