That much I can do - but to shut the tap off so we can flush the toilet etc?
I have no idea how these are actually used, but looks like it might be useful if the pipe is exposed?
https://www.screwfix.com/p/self-cutting-isolating-valve-15mm/59752?tc=UA5&ds_rl=1249404&gclid=Cj0KCQjw756lBhDMARIsAEI0AgnFnnmxyztVWweqj0Hl26YW2zbTCR_PcG3gxWJZaPzVCsh1pVj0igYaAqBAEALw_wcB&gclsrc=aw.ds
@Polygon started
London Fixed Gear and Single-Speed is a community of fixed gear and single-speed cyclists.
That much I can do - but to shut the tap off so we can flush the toilet etc?