I think the people you've heard that from are probably being rather silly. For I start, I would expect something at the start of those regs to define what all the regs relate to but, even if it didn't, one surely has to take 'context' into account - I haven't looked for a long lime, but I imagine that, for example, the Highway Code often says "you must" or "you must not", without explaining that that only applied if one was driving or riding a vehicle
That may make make some sense in relation to 'public places', but it really doesn't in relation to domestic dwellings (over which those doing the work have absolutely no control), does it?