Regulation 526-04-01 refers to accessability of junction blocks

An NICEIC recommendation says
"However, connections required by regulation 526-04-01 to be sccessible
should NOT generally be located under a floor where a carpet is likely
to be laid. A fitted carpet can effectivley render connections beneath
the floor inaccessible because of objections from the occupier to the
carpet being lifted, or difficulties in finding the access trap."

But it does seem to be a widely ignored reccomendation.