As mentioned, that is not usually considered a serviceable part.
Being your across the pond, I guess you choices are some what limited.
If you have the patients for it, I say go for it.

That metal is kind of soft, maybe you could pry the socket open a bit. Then press them together again once you have seated the cables. Or maybe make a holder and/or put it in a vise, so as to tap them in with a hammer and punch.
Be careful though as it's also old and might be brittle.