A friend hadd to replace their cooker so brought one but the installer said the cable was too short so he couldn't install it so left. (PC world/currys or some shop)

Seems there are two options

1/ extend the cooker cable (that's too short) using a suitable junction box and cable


2/ just extend the existing lead by crimping, soldering, or terminal block with a suitable bit of cable (32 amp).

Is there anyhting else I need to be aware of as it seems a relatively simple job.

I'll probbely just pop in to B here and Q fort the stuff