mains isolator

I bought two VASF100T timer extractor fans to replace the existing fans in 2 bathrooms. It says the fans need 3 amp fuses to protect them. My current setup has an isolator switch for the the fan and 6 amp fuse for the downstairs lighting in the house's mains fuse box (MCB). I guess the options...

Hi The main Stopcock is a bit dodgy so I'm going to get a plumber to change, I was thinking of then getting him to fit an isolator just after this so that if ever I need to turn the water off I can just turn a lever as opposed to winding the stopcock as I would feel more relaxed knowing we had a...