Delighted to have achieved the certification... finally! Wouldn't have got there without the support of the guys at ISO (thanks to Thomas Pollard). The application was sent back many times, with many different, often quite detailed technical questions. But we got there in the end and is effective from end June last year. And the combination of FIT and RHI gives strong financial backing to the logic of combining hydro/electric with heat pumps to make the most of the output on site.