New 12 zone install help for newbie!

[Luggsey]

I just realised that if I site the manifold in the 'cloaks' cupboard the amount of ufh pipes in the hall outside the cupboard will mean I would not be able to pipe that area as a zone?
In this case do I simply use the amount of pipes going to other zones in the hall to heat it?

I had initially thought to use radiators upstairs but is it feasible to wet ufh on top of a chipboard sub floor? I have seen insulation panels with the pipe route pre cut into them, does this stuff work well and who makes it?

 

[Chalker]

Without having sizes of rooms. But a quick look, I calculate you will need 15 loops. That's with combining your fall and wc. This will mean two manifolds. One in the hall and one in the cupboard in the dining room.
Rads on the first floor is always the best option. It heats and cools faster.