There should be a gate valve on the cold inlet at the bottom of the hot water cylinder.
Right, will have a look…
Whatever valves you find, take the time to label them for future reference.
Oh, I do that with everything! Not having much of a memory
Removing the bath panel or looking under the basin might just reveal ball-type isolators but take care when closing these not to press hard on the screwdriver or the ball will leak.
No such luck sadly
