From a purely practical point of view, I can't see how you would add a fifth connection to that mess without tidying up what's already there.
A set of Wago connectors ought to do the job nicely.
(was the socket covering that junction also somehow connected to that lot?)
The old junction was being covered by the socket and wasn't in use anymore. As you say it will all get tidied up in new junction box.
@Tomo187 started
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From a purely practical point of view, I can't see how you would add a fifth connection to that mess without tidying up what's already there.
A set of Wago connectors ought to do the job nicely.
(was the socket covering that junction also somehow connected to that lot?)