Glad you said that... Following advise from earlier posters, I was tempted to bring the cables to the top of the leaf.. This would have bought them to around 20-30mm from the top of the wall, and once the 'window sills' had gone in, less than 50mm below a surface.
I spoke to our office 'electrician' and doesn't see a problem leaveing the cable in the cavity as it is.. Sure, its quite sharp down there, but there is going to be very little (if any) movement once its all finished and therefore little risk of damage in the future.
Now that the base and wall is finished, I don't really have much choice.. As I said above, I could quite easily raise them to the top of the walls, but then I would break the regulations (150mm and 50mm) that you mention..
I simply can't win!
Many thanks for the advice.
Jon