Doing a lot of EICRs in London at the moment and I'd say every other C.U. has a ring circuit with no continuity on one of the conductors. Seeing as the IET see fit to tinker around the edges constantly with the regs, I struggle to understand why these potentially extremely dangerous circuits are still permitted. Yet bonding and earth conductors have almost doubled in size because, well, they said so. It's not 1949 anymore. Ban the damn things.