Home DIY

I've got a single plug socket that I want to replace with a double. Problem is that the existing wiring is incredibly tight and I'm worried that any replacement I buy might have a different layout of connections and won't fit.

Would I be ok to wire the existing mains cable into a (15 amp?) terminal block, and then run short lengths of the red/black wires between that and the socket?

I had this problem replacing a double socket recently. I bought a crimping tool, crimps and some heatshrink to extend the tails. It's a really solid and building regs approved solution, plus it's useful kit to own in the long term. Check out TLC-direct for some good value kit.