Ummm, no... o 8% yield is effectively coming out of your capital o You do not get your capital back in the future o There are no guarantees about future FiT
Contrast with UK Gilts or US Treasuries. Ok, you MIGHT not get your capital back in the future either but it is at least possible if not probable :-)
This is a welfare program for Sharp's Welsh factories? Anymore stakeholders or rather spongeholder energy technologies out there who want the economies of scale to come out of taxpayer welfare programs (and snaking line of brown overalls as ministry of silly walks).
If the govmint wants to do something put ASHP under Permitted Development with a reasonable noise standard (they still haven't defined the damn thing).