Not seen one of these before and as I have been in this house for some time never had one performed on this house. As it is a row of identical semis built in the late 1980's I thought I would see if I could get an idea of what was being said.
Blow me, next door but one had one produced in April 2014 one of the "recommendations" (admittedly the last of 10 recommendations after fitting solar Water heating and solar PV was to fit a WIND TURBINE.........)
At a cost of £1500 to £4000 (their figures) and a payback rate of £86/yr (again their figs) this makes a payback period of 17 to 46 years. And they are "recommending" that this be done - I am speechless.
This in the bottom of a hollow on a modern-ish housing estate.