Yes there are, but so far you seem intent on ignoring them.
To be fair, you've had a lot of quality advice, including from BAS in his own blunt manner. That it's not the answer you want doesn't make it bad advice.
It's only after some to-ing and fro-ing that you've come up with the information that these cables will be dead at some point. In the absence of that, the only answers that could be given would be those for properly dealing with live cables. Now that they are to be dead, then AFTER THEY ARE DEAD the answers are different - ideally you remove them altogether, if not then remove as much as is possible including cutting them under the floor so there's no way they can be reconnected by mistake, and only then can you simply fill in the hole.
Yeah I get all that and I appreciate the advice from those quality contributors like John, who obviously got offended there, and it wasn't meant in that way.
Yes all of that is very good but it's not really the solution I was looking for. After checking all the sockets in the property I figured out this one room was on a radial circuit. So that's one socket with one spur wired to it. The rest of the flat is on a ring. It was that simple. It would be good if people didn't give advice without taking the whole scenario into account, rather than give info semi-blind without asking me to clarify things first. It wasn't hard to work this out. So the radial has been taken offline at the consumer unit and the hole filled in with no box at all. I don't agree with your comments about banallsheds giving advice, he's not given me one piece of useful information in this subsection in the entire time I've been here. Perhaps in another section but so few and far between I don't recall. I still stand by the fact there are some 'old timers here' that can't accept people can do what they can, so they want to make it hard for them. He's like this in my view. It's not something I welcome. Sorry.
I would like to post progress posts here but I don't really want to because it's all negative. Hardly makes me want to contribute anything because of that.