In the case of the SI singles, one can but hope/assume that any CPC would be insulated - and that's the bit I was thinking about. However,as for the T+E which cut-back sheath, we have not been told whether the CPC entering the box has a G/Y sleeving or not, so the jury's out on that one. However, even if there is an inch or two of bare CPC buried in the wall, I really don't think that would be anything to lose much sleep over, do you? [let's face it, if it were singles in earthed conduit, there would be a massive great earthed 'pipe' in there!!]I gather at the start of this thread, there was a mixture of single insulated singles, and twin+e cable where the sheath does not enter the box, both buried in the wall without conduit. So one may expect the CPC to be a bare conductor.
Kind Regards, John