Next year there is to be a Renewable Heat Incentive for domestic
buildings.
As far as I can see it will cover solar thermal panels (for hot water)
and ground/air source heat pumps. It can be connected to existing
heating systems. Ground source works better but is much more
expensive
As heat is difficult to measure, an assessment is to be made for the
money they give you to heat your home. Also a small grant is made
available towards the capital cost. Again, as with the FIT, tax free
and it lasts for twenty years.

So you want to be thinking now about going for this one when it comes
out.

TurNiP will be helping to finance it out of his taxes so that alone
makes it worth thinking about. :-)
Bit about it he-
http://en.wikipedia.org/wiki/Renewable_Heat_Incentive