Oh yes you must comply - think of the consequences if you don't. The world may end - it could be worse than global warming .
Or you could look at Approved Document M section 4.25 and decide that the exception mentioned there for floor boxes in open plan offices might just be applicable in your situation. The actual Regulations just appear to call for 'reasonable provision' for the "use the building and its facilities".
I am sure one of the many 'experts' on the Building Regulations that post on here will give you a more definitive answer.
BTW are you sure the term Dwarf Wall is acceptable - surely that should be vertically challenged .
Do what ever looks right, ask the client where they would prefer them to be placed, no one will shoot you, promise!
It's only a requirement in new builds and even then if the client says they would like them lower, I'd put them lower.
I have had so many arguments about height from mounting thermostat too low specially so my mother in a wheel chair can reach it. And bedroom sockets too low so they go under bed and are not damaged by the bed being pulled away and then returned to wall.
Even Part M can't seem to make it's mind up and why 400mm in commercial and 450mm in domestic I have never worked out.
Each time as soon as explained why they have been accepted and I now just use common sense.
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