We opted for twin skin fully insulated Shetland 2 cabin. After using it for a couple or weeks we are really happy with it. Even with very cold minus temperatures we have just one small electric heater on low and the cabin is hot. The installers recommended by Jacks were brilliant and stayed late to finish the build in one day. Everything was just right except for one item. We were charged £1,100 for floor and roof insulation and bought it as time was tight and we did not know what it included. We feel ripped off by this as we could have bought it separately for just £250.