I have a junction box on a ring main below a bedroom floor, where a cable leaves to form a spur to a single socket. I know this does not conform to the wiring regulations (where all screw terminal should be accessible).
Replacing the cables to eliminate the junction box would require underfloor access to other rooms, alternatively replacing the screw connections with crimped connections requires obtaining the specialised tools (or employing someone who has them).
What are the practical issues in leaving things as they are? Is it just that in the (unlikely) event of a fault developing it would be necessary to lift the floor?
[As an aside this was a house rewire carried out (and certified) about 8 years ago by an NICEIC contractor. With the introduction of Part P no doubt such poor practices will become more common!]
James