Hi Harry - It is Radian's intention to post the questions and the panel member's replies on our website in the very near future. We want to then keep a blog going and add some of the further questions that we didn't get time to consider on the day. Most of the questions asked during the event revolved around the inevitable finance e.g. 'how do we pay for it' and the resident's perspective / behavioural patterns. Please keep an eye on our web www.radian.co.uk
You are right to query what the best approach is and I think often the scattergun method will produce the better carbon savings especially if it is for basic measures like insulation. It is also much fairer as more residents stand to benefit. In honesty I think the only way to be sure is to do some before and after carbon modelling. Ideally using full SAP but using Reduced Data SAP as for EPC's would give a general idea. So much depends on the baseline position of the homes and the primary fuel they use. Solar panels will save much more carbon when displacing electric heating than gas heating for example.
At the moment we are doing whole house refurbishments to align with our asset management strategy where considerable money needs to be spent on improving a home in any event.
With best wishes, Paul