I'm about to start swapping out our old bathroom suite and I've noticed that
there is no way of stopping the water bar using the stopcock downstairs. I
have been told that to conform the current water regs?/byelaws all baths,
cistern etc must have a means of isolating the supply, So my question is
whats the difference between a service valve and isolating valve or more
importantly when should I use either in a bathroom?