Underfloor heating - internal walls on slab

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Hi there!

Seeking some direction or reference to building regs that would be applicable please...
I'm currently digging out the floor slab in the living room/lounge of my 1960s house. The slab is about 6 inch thick concrete.
At one end of the room there is an internal brick wall, single skin, which it resting on the slab.

Question:
How much of the existing slab should I leave for the internal wall to sit on? On the other side of the internal wall are a utility room and a downstairs toilet, which will be left un touched in terms of flooring.

Initial thought was maybe 6 inches or so but I also need to dig down in to the soil where the underfloor heating will go to make enough room for compacted aggregate, sand, new slab, insulation & screed.

Any thoughts - attached in a floor plan showing the wall in question
 

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...in case anyone is interested, the answer is...

You ask a structural engineer, who comes up with a solution for you :)

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