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Concerning the 50 mm air space, doe this still applies when you have breathable felt, because I mentioned this to the building inspector, and he responded that I can place the kingspan close up to the felt, due to the fact I have used breathable felt, as long as their was a bit of slack on the...

Thanks for that valuable info. However, does that mean that I must use to layers of kingspan that makes up the 145 mm thickness. ie 80mm kingspan in between the rafter and 65mm kingspan cross batten.

I have been informed by the building inspector that the rafter insulation must achieve a U value of 0.2., therefore I must use 145 mm Kinspan which I think is a bit excessive. However, to comply with existing building regs are their any other products that achive the u value stated above, and...