Having an electric oven installed, has switch on wall behind

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Yes, for the convenience of being able to fully isolate a faulty appliance in order that the RCD that is being tripped by that faulty appliance can be reset and thus restore power to the circuit

Or maybe you consider getting tools and disconnecting cables from junction boxes is not a significant inconvenience.
I hear you.
In fact this has probably happened to all of us.
One faulty appliance tripping the circuit rcd.
 
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Do not joint and tile over unless some other electrical appliance (socket or switch) maintains that buried cable safe zone.
 
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Element leaks ? Leaks from where to where ? Are these "element leaks" you refer to just leakage from Live to Neutral without any involvement of the metallic sheath of the elements affected.

Please think before you type
Engage brain before keyboard. You don’t get leaks from L to N in an element. It is only a few 10s of ohms anyway.
 
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2. True. Cookers (the only appliance that needs hard wiring) usually have element leaks not neutral earth shorts.

Engage brain before keyboard. You don’t get leaks from L to N in an element. It is only a few 10s of ohms anyway.

Think about your statements quoted above. usually have element leaks You don’t get leaks from L to N in an element.

If there is a leak in the element then where do the leaked electrons go if not to the Earthed sheath of the element creating an imbalance that can cause the RCD to trip.
 

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