Whats this wire?

[viewer]

With trepidation ...........
All posts refer to disconnecting the green wire from the socket and thus causing an earth/bonding problem for that area, however, the OP mentions that the green wire goes back to a JB. The disconnected wire could be the earth for the circuit fed by the JB.
Suggest that, although the OP needs help, s/he should reconnect the green until a proper examination can be made.

 

[SimonH2]

Here I believe I found the issue, the loft has a socket for a light to run off it. as you can see is a old plug so is going to get replaced tomorrow ...

View media item 55797

That looks like a good old MK socket.

Personally, unless it's damaged then I'd leave it there - it will almost certainly be of "better quality and construction" than many modern replacements.
In fact, we have an extension lead with one of those on a small piece of wood at one end, and the matching plug from the period on the other. It's been in service as long as I can remember (well, almost certainly longer). In fact, there's a good chance it was made at the same time as the "long lead" which is a double version of that mounted on a wooden cable drum - I know for a fact that that one is older than me, and was made to allow dad's old electric mower to reach down the garden where they lived before I was around which was (IIRC) a couple of hundred feet long.
Must have been pretty good quality (rubber covered) cable as well, as that's still in good condition.

 

[Scoby_Beasley]

I know for a fact that that one is older than me, and was made to allow dad's old electric mower to reach down the garden where they lived before I was around which was (IIRC) a couple of hundred feet long.

I was expecting a couple of hundred years ago!

 

[streetlighter]

Them old MK sockets are open backed and so the terminations are backing right onto the wood a combustible material.
I've removed several of them from a house I'm working on recently all mounted right on the skirting board !

 

[RF Lighting]

Just like those open backed batten lamp holders you always find in people's lofts. One to watch out for on EICRs...