Fabric Fifth (not First) - a required change in emphasis?

The mantra seems to fabric first, fabric first....
We need to rapidly reduce emissions, lower energy bills as well as deliver comfortable and healthy homes, so where should we be prioritising spending our money in the UK. The housing industry has championed “Fabric First” for decades, but should we be thinking differently and reprioritise where funds are spent?
Nigel Banks, Technical Director for Zero Bills and Low Carbon Homes with Octopus Energy definitely thinks so. He's joined by Simon Roberts, Founder, Heatio and host of the Home Energy Show, to discuss other measures that move “major fabric improvements” down to fifth place (in most homes). Will you agree with them?