In reply to 4712topo:
No supplier in the uk that im aware of.
You Buy direct from Henry Shires online.
Drop him an email. Their service and after sales service is very good.
Ive made 3 purchases without problems.
Ive never used a conventional tent.
Depending on weather conditions you do get condensation, but you MANAGE it, it is not a problem. Always have a mini pack towel to hand.
I think im correct when i say double skin tents suffer condensation also. you just dont notice it. Which means when you pack the tent away it may not be dry and you end up carrying even more weight.
Note you will need to seam seal the contrail. Its very easy to do and do not let this little job put you off making a purchase.
Ive never yet been in a situation when ive thought i wish i had a conventional tent.
If the weather looks to be marginal then i use the rab bivvy over my summer bag this is a big insulator allowing you to maximize through tarp ventilation.
mh