Hi. thanks for the replies. I think a few have misunderstood though... It doesn't help that Shetlink moved this from Consumer Advice to Crofting forum!
I'm not looking for Shetland wool for insulation, I'm looking for ready made loft insulation that's made from Sheeps Wool. Its common now and plenty of online insulation suppliers post it out, B&Q even sell it, but obviously no one will do delivery to Shetland. I'm sure some people have used it in Shetland properties and looking for a builder that's worked with it in the past basically for how they managed to source it.
I'll try Shetland Heatwise first - thanks for that.
I have a feeling it is going to be too expensive to be worth it, but will try anyway!