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3x 3 screwless terminals is much easier than trying to get three wires into one screw terminal IMHO. I expect if you are an electrician that does it all the time you get better at it but for occasional people screwless is so much easier.
I think you can extend with some 32A connectors - I'd use Wagos - but I'm not sure. I'd be very slightly worried about 2.5mm not being rated to the breaker but you are unlikely to ever get to 20+ amps. You might find the back box is too shallow for the extra connectors though.
I'm changing two double wall sockets in a bedroom that we have recently decorated.
First one was a cinch with only three wires on the existing socket and aside from adding an earth from the socket to the metal backing plate took less than ten minutes.
However the second one has nine wires going into three terminals (3 x L, N & E).
As if this wasn't painful enough i.e squeezing three wires into each terminal, the wires are quite short and the new socket has terminals in different places to the existing socket meaning that they are unlikely to reach far enough once I try to fix the socket in the backplate.
Any suggestions, for example is there a recommended, safe way of extending the wires or should I just give it up as a bad job and leave the old socket in place?