This starts quite easily but gets harder as you have to cut more boards to fit into door and windows. The board i'm using is a French product desinged for underfloor heating. Its EFISOL in 56mm thickness.
All in all it took about a day to lay the boards and then fit the insulation round the edge
Next was the pipework. This was a kit off the internet and I have to say the quality of the kit was very good, a good branded kit, delivered next day and clear instructions. There are loads around but mine came from: http://www.theunderfloorheatingstore-onlineshop.com
The kit comes with the manifold and all the tools to cut the pipe.
Now ready for the screed..