I have had my ladies for around 7 months now (lucky me

We have converted a shed for them, and have an attached run. It at the bottom of my garden, and has massive trees surrounding it.
As we are getting close to winter, I am worried about them being cold?
Theres loads of room in there, its a 6x4 shed, big window with a plastic covering a slope that comes off it (to stop rain going in) so theres lots of venitlation in there, but we have a proper good winter last year and I expect it will be this year.
Will they be ok? or are there soem things I should do for them?
Thanks
