In my opinion, any environmental technology is now more or less defunct. RHI, FIT's and the Green Deal may sound like good opportunities and they probably are to the Big companies who are pulling the strings behind the scenes. For the one man band installers it is a futile exercise. Personally I refuse to spend any more money on trying to get accredited for MCS. I trained in Solar PV & Heat Pumps only to have the rug pulled out from under me by the reduction in the tariffs and the unexplainably high energy rating level you need to achieve after April in order to qualify for 21p/kWh. If your home is not at "C" then the proposed FIT will be 9p/kWh. Who is going to invest in that? The RHI is doomed and making people very nervous as the gov has dithered about the rates for commercial installations, certain technologies are unsuitable (how they manage to differentiate between heating your home via the ground or air is beyond me) and the recent cut in FITs has developed a genuine mistrust (and IMO not misguided by any means) in the powers that be.
The Green Deal is supposed to bring us all lots of work upgrading home insulation, heating controls and high efficiency boilers to existing housing stock.. so you would think, but unfortunately in order to qualify to fit under this new scheme you will need to be re-trained and re-accredited to some other new qualification which someone has dreamed up. If I was a suspicious person I would say it probably has something to do with the cosy little meetings the energy companies have been having with DECC. But I dont feel that a public forum would be the place to cast dispersions about our "Honourable Members" would you?
So In closing... no I think it would be a waste of time and I'm personally sticking to fitting gas boilers, although if anyone wants a heat pump fitted outside of the new schemes they are welcome to get in touch.