a reflective foil behind it and a ga to the wall will make sure most of the heat goes inside the shed alternatively you can keep an italian woman in the shed to keep you fit, active & warm and make you think you are riding a ducati
I am blessed! Whilst walking to the local shops, I spotted a couple of sheets of 30mm insulation in a domestic skip. Did the right thing and asked the owner if I could have them, and presto, I can now line most of my shed with good insulation. Will do the roof first, then there'll be enough left to do the weather-facing wall. A couple of tubes of Gorilla Glue and a can of expanding foam to fill the wall/roof gap and I'm well on the way!!
Crickey, BSS. @Lozzy comes up with some doozies, but yours (above) will take hell of an effort to beat. Well done. How the frig?