I've had an excellent plasterer in for the last couple of days, making
a start on my renovated first floor. The water supply upstairs is
currently just tails with service valves, behind the bathroom to be.
Helpfully, I rigged up a standpipe for him so he wouldn't have to keep
going up and down stairs with his bad knee.

Last night I found a frantic note, asking if I could stop hot water
coming out of his standpipe. Possibly I should have checked which tail
I'd taken the supply from.

Apparently it's really hard to plaster with hot water ... He'd been
filling all his buckets in one go and hoping the water would cool down
before he had to use it.

Oops.

Regards
Richard