I hope you and Mr T feel better soon @Trewsers
Landlord came with a different plumber tonight, I do have a working immersion now, but the main hot water still won’t work he spent 2 hours fiddling but no luck, landlord asked me to clip the control panel back on as he didn’t have his glasses (it’s a really simple push fit) and there was a big flash, bang and all the fuses tripped! Looks like in the messing about last week someone got some wires in the wrong place. I’m getting a bit frustrated now, this is the 3rd day I’ve given up my free time and the other plumber is going to have to come again next week, and I suspect a sparky after that when he can’t fix it either (most of the plumber parts have been replaced now so don’t see he’ll do anything different to the guy today).
What a carry on!