Not often I recommend a contractor, however (and not just because of the small incentive to make the recommendation), if you're thinking about insulating your conservatory roof, or are thinking of replacing your conservatory roof, because its 'too hot in the summer' or 'too cold in the winter' I would definitely recommend '2hot2cold' (of Surrey - who cover Sussex etc) - who have just completed our conservatory roof (and wall) - insulated with material with a u-value (how much heat it loses) of 0.175. Its pretty damn good actually - and has transformed our conservatory from a cold unusable room during winter into an actually warm room - first 5.45am morning test and the verdict was 'its actually not too cold' - it worked! Pretty good value and if you speak to Caroline she will probably do you a good deal, as she did for us. So, happy customer - recommended company and great feedback on checkatrade too. See photos - and if you feel like it mention my name when enquiring!
https://www.facebook.com/2hot2cold/?fref=ts
http://www.2hot-2cold.com/