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that assumes the pipework is 15mm and will play nicely - it isn't and it won't
up into the loft you go.. @CYOA
in fact, turn the water off at the main in case fiddling with the loft tank stop cock ends up with tank overflow/fail hilarity
rive_gauche
CYOA
Personally I'd get a pipe freezing kit. Freeze the incoming water pipe, cut it and put a quarter turn isolation valve on it first. Then you can faff around with the toilet as much as you want without draining down the loft tank or worrying about the flooding when you run out of freeze spray.