Oh, that's what I was doing is it? Sorry, I didn't realise. I thought I was learning.
What has the three foot of 2.5+1.5 T&E between the old position and the socket been then, if not added? I'm aware this is a very by-the-book approach to the regs but that's the way I roll. Look at it this way: install new socket without RCD protection, document it, client electrocutes themselves from it. The worry in addition to any criminal charge is whether the relatives launch a large civil claim for damages. Your PL / PI insurer will probably refuse to cover you because you have operated outside the rules you are meant to operate within. You are now ****ed.
So my inclination, based on the useful posts from others, is that I would push the client towards RCD protected socket (or if original socket postion wasn't getting blocked off, RCD FCU), although being honest about the fact I needed to do so to cover myself (let's face it, what does one RCD protected socket add, unless you sell the benefits for outdoor equipment etc.). Whether I would at a push do it non RCD protected for cash with no paperwork, I offer no comment!
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Which means you can't use screwed terminals or anything else which must have maintenance access.