Kitchen Wiring

[ScottBram]

My kitchen wiring is a mess!

The cooker isolation switchis inside a cupboard above the built in cooker and is an older type with a 3-pin socket on the same face plate. The old owner has plugged in a 13amp plug with 2 grey flexi wires, one to feed the cooker extract and one going to 2 under bench lights which are the old tube type with filament bulbs in them.

My questions are:
1. Should I replace the cooker Isolation switch & will it need to be relocated outside the cupboard?
2. Should I rewire the lights to the overhead light circuit?
3. What size wiring should be used from the Consumer Unit to the Cooker Isloation Switch?
4. Do the bench sockets need to be on a seperate circuit from other rooms?
5. Is 1.5mm ok to use for the lighting throughout the house?

Thanks :-)

[buildersmate]

Applicable to all of your questions: the only way you can do any of this work is to make a Part P Building Regs application. Or use a Part P certified electrician. That's the law.
1) Having the type of cooker isolation switch you have is not a problem per se; having other wires hung out the bottom of it is a problem. I am not aware of a Reg that says the switch can't be in a cupboard.
2) Yes
3) 6 mm. squared is usual.
4) It is usual to have the kitchen sockets on a separate circuit to the rest of the house but not a Regulation - it also depends on the size of the house and the total number of circuits.
5) Yes - more than adequate unless the house is a palace and the total cable length of the circuit is absolutely massive.