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The problem you have is the PME supply- return current from the pme supply will take the shortest route back to the LV TX. A small amount is likely to return via the TN-C-S main equipotential bonding to the TN-S supply earth etc. This value of current could get higher! as the TN-C-S demand goes...

use a clamp meter. or a quallity tested current meter but make sure leads are gs38 type.

your electrician is wrong to sugest that you could install a 3 kw oven to a final socket circuit. think of other equipment in your kitchen/ house on the same final circuit. eg washing / tumble .. alone they could total say 26 amps, leaving only 6 amps for your 13a oven. ring power circuits are...

your earthing arrangments need to be checked asap. A rcd will not solve the problem call a approved contractor only and dont call the dodgy bloke again. get him to check the main and cross bonding conductors and there impedance to earth. also method of eathing, as if on a PME supply...

Some modern domestic cookers require a 50a double pole isolator. Most isolators available are 45a (crabtree do a 50a double pole switch). This presents a problem as if the cooker load is greater that 45a the double pole switch could become overloaded. The mcb at the consumer unit must not be...