Electrical – Is the ceramic hob wired correctly

If it is solely for the use of the electronic ignition then wire it in anywhere you please. The ignition does not use that much power.

But if it has a electrocnic cooker then you need a dedicated socket AND dedicated breaker with out anything else running on that ciruit, which is also rated at high amperage and earth leakage.(Usually stoves likes this do not use a plug but have to be hard wired with copper cable into the oven where there are several warning messages)

I assume your in the U.K as this sounds like a typical set-up for cookers in a kitchen area. The circuit feeds a control switch or cooker unit switch which may incorporate a one socket-outlet. The rating of the circuit depends on the current demand of the cooker. A 32A circuit breaker is normally sufficient for cookers up to 15kW. Wiring a cooker circuit with a rating more than 15A but not exceeding 50A may supply two or more cooking appliances where they are installed in one room. The cooker switch should be installed within 2m of the cooker but not directly above it. One switch may be used to isolate two cooking appliances where they are installed in the same room but neither are more than 2m from the cooker switch. A minimum cable size of 6mm flat twin & earth cable can be used for a typical cooker circuit (from the CU) with a maximum load of 15kW with a maximum cable run lenght of 28m (installed above a plasterboard ceiling covered by thermal insulation not exceeding 100mm thick).

In summary make sure to check the new appliance is the correct power/current rating. However normally to replace like for like is perfectly fine