Fitting a new shower to the mains, assumed the 2 stopcocks in the bathroom would isolate it just cracked the nut a touch to be careful, never found the nut, spent ages while trying to divert water into the bath trying to figure out where the stopcock was!
Turns out the plumbing was bodged so that any stopcock was fitted after the shower so I had to get a neighbour to turn it off outside at the mains!