Overcabled Socket
Some options to sort out a socket crammed with 4 T&E cables, 2 for the ring and 2 spurs.
Use the existing pattress as a junction box with choc block connectors. Fit a surface mount pattress on top of the existing recessed one. Washers are needed wth the screws fixing the new pattress to the old. Refit the socket.
Use a shallow depth socket to give a bit more room for wires & connectors.
Use crimps to extend any wires too short
Add a 2nd socket beside the existing one. Now one of the spurs can be moved to the new socket, leaving 3 cables for the original socket.
Turn the existing socket into a junction box with choc blocks, and fit a blanking plate.
Persevere and get all 4 cables into the existing socket. Stripping off the outer pvc insulation the full length helps with this.