The power to my summer house is supplied by an underground SWA cable. (Pre-part P). I'm thinking of having whole system checked out and wondered whether this bit would comply to modern regs. They don't seem to specify a depth but sufficiently protected, although 500mm is often mentioned. The thing is the whole length is at a depth of about 150mm but is completely covered by drive blocks. Surely this is more protected than a deeper depth in soil alone and should comply? Also there was no warning tape around cable. What do you think?