I am wanting to change from a single electric oven to double - there is a gas hob. The house is a couple of years old, and has the new fangled wiring. The oven does not appear to have its own elec supply, it seems to be on the same supply as the downstairs sockets. Am I able to just change the single oven for a double ? I always thought that you should have a dedicated electricity supply for an electric cooker. Is this new wiring different ?