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If you are extending the circuit you need to make sure the breaker is the right rating for the cable you are adding. In this case it might be easier to change the breaker for a 16 and use 2.5 t&e to extend the circuit. Otherwise you will have to stick to 4mm. There are other considerations with cable rating that an electrician on site would quickly establish but 32a is fine for a 4mm cable clipped to a surface.
There are some considerations about cable routing if it's going in a wall. If your breaker is protected by an rcd there's less to worry about but you can't have any diagonal cable runs.
Thanks. Ok sounds relatively straight forward then. I think I can use the sockets themselves as the junctions.
Is it worth getting an electrician in to discuss and get them to connect it once the work is done, or not necessary?
I would have to run the cable either behind or underneath the range, there's loads of clearance but does that present any problems ?
The current dishwasher socket is lose on the floor so can only be improved!