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@Airhead
You're right. I was being a little overzealous. As long as it runs horizontally or vertically or in the corners of the room/top of the walls it can be less than 50mm. It does then need to be RCD protected.
Non RCD protected needs to be more than 50mm deep.
I'm usually working with stud walls so I'd drill the centre of the stud in any case.
Part P Section 2.3.3.