get forces sleeping bag with the the gortex bivi bag, its all you need in this country with a closed cell mat beneath
 
Just take a yurt along with you with a wood burner in it.. Jobs a goodun.. I am sat in mine right now, all toasty..
Just take a load of duvets and plenty of mats to sleep on (sheep fleeces are good) and snuggle up n you guys will be ok.. I like to kip out in my hammock in the winter, its great sleeping out in the cold when you are warm in yer bag..
 

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