Look for things that are RHI backed..
Consider the Green Deal as a Process not a solution, also consider GDA's as Green Deal
Assessors, NOT
Advisers as they are SUPPOSED to be..
#1 Insulate
#2 Insulate
#3 Insulate
What is the current fabric of your house?
Look at Loft (250mm at the LEAST), Cavity Wall, Exterior Wall (EWI) and Interior Wall (IWI) Insulation plus better windows and doors
Draught proof every where
If you go for a Green Deal Plan, you DO NOT have to take the finance (so you can fund it yourself) to get any ECO contribution that you may qualify for e.g for IWI or EWI
I expect that some ECO money will start to become available late April / May time.
Then look at how you heat the house - if you are on mains gas, the make sure you have a modern efficient reliable condensing gas boiler.
Also install at a timer and least one room stat and TRV's on all the remaining radiators, better still go for the honeywell evo system that lets you effectively zone the house into up to 8 (12) zones with different temperatures and different times. If you've got a hot water cylinder and immersion, consider adding PV and using an ImmerSUN unit to heat the hot water via the immersion for "free". The FiT will more than compensate you for the capital installation cost.
If not on mains gas grid, then if you can get your heat loss below 50w/m2 consider an Air Source Heat Pump, and new larger radiators to get the flow temperature down to 45° . - The RHI will once again compensate you for the capital installation costs.
If still struggling with the heat loss the fit a quality biomass boiler, or maybe even a Ground Source Heat Pump, if you don't have land, you can go for a vertical collector (aka borehole), once again the RHI will compensate you for the capital installation costs.
IF you are of good financial standing then finance it initally yourself / take out a commercial loan - the RHI repayments are designed to cover that scenario.
IF NOT of such good standing then a Green Deal Finance plan MAY be available to cover the capital costs...
Latest from Barking ... Domestic RHI (DRHI) will be live BEFORE EASTER.
FACT: The DRHI went through the first pass of the House Commons a few weeks ago, and cleared the House of Lords yesterday (26th March), is back to the House of Commons on the 2nd April.
Supposition:
so pre-Easter Launch on target...
Look here:
Charging the Earth - Solar!
Charging the Earth - Solar!: Heatloss+Energy