I don't normally like doing this but what is the modern version of the old fashioned chocblock.
It's just i need to extend a 2 core mains wire for an alarm clock, i did take it apart with the idea of just rewiring it with a longer 2 core cable but the mains wires were wired into a small transformer looking thing and it was beyond my knowledge to take that apart so will have to add to its length but butting 2 sets of wires together.
Jim
p.s. screwfix/amazon/ebay are fine with me