With the impending arrival of our wee baby we are considering getting this done. The upstairs in our house is always considerably colder than downstairs.
my rough calculation going on the price per sq metre is £1300. Now the first thing, the guy told me to measure the length and the width of the house and that will give me the sq m that I need, is this correct?

and now more importantly, has anybody got this done and what are your thoughts, there are some horror stories on www about people getting rot because the roof can't breath etc. the guy on the phone told me that the installers leave a 50mm gap between the roof lining and the foam itself to allow the wood to breath and to prevent sweating etc.

any info good or bad would be much appreciated. This would be our biggest outgoing in terms of home improvement since moving here 6 years so want to get the decision right. Plus if it is a lemon of an idea I'd rather know as the £1300 could definately be better spent on baby stuff.....