I've just returned from living in the south of Spain where all the circuits in the consumer units are protected by one isolator and one RCD. I think this is because all of the supplies are overhead and the supplier doesn't supply a earth. Each supply goes to a metal pylon or similar on your property and that itself is earthed as an electrode into the ground. I think (but not attall sure) that this is called a TT system in the UK? Does this type of total protection apply here in the UK if no earth is supplied or can a split load be installed, with some not on RCD protection? I ask because i found that in a small nuisance fault situation everything was disconnected losing the lights and defrosting the freezer if i was away from home.