Not specifically, as far as I am aware, unless a plug/socket counts as a 'joint' between conductors. Having said that, if there are two or more cables going to the socket (e.g. if it is part of a ring, or anwhere mut the end of a radial), then that would seem to be no less of a 'joint' than one has in a JB (which has to be accessible, unless 'MF') - so maybe that catches it. Logically, the requirement for accessibility ought to extend to anything involving screw terminal connections to conductors, I suppose.
Furthermore, I have a feeling that there is somewhere a general requirement for all accessories etc. to be available 'for inspection and testing' somewhere - I'll see if I can find it, if no-one else chirps in with the answer. It would certainly be impossible to, say, 'fully test' a ring final if one or more of the sockets was inaccessible.
Indeed, and we've discussed that one before. Behind a heavy piece of furniture (so long as it remains in place) is really just as 'bad' as hidden under floorboards or whatever, and therefore probably ought to be outlawed by the regs on the grounds of inaccessibility. The problem is, of course, that furniture (even heavy furniture) can, and does, move - which makes it a bit difficult to regulate!
However, as I've just written, more generally I think it is reasonable to say that any electrical connection with screwed terminals ought to be subject to the same accessibility requirements (however you wish to interpret them in relation to heavy furniture!) as, say, JBs.
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