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I would agree with Neil Cutland's comments. The Occupancy Assessment (OA) in Green Deal is absolutely critical to give the householder a more bespoke calculation of their savings, based on their actual occupancy. 73% of residents said they were warmer after the work - demonstrating that they were under heating their homes in the first place. The OA would have been able to model this. The OA is a new concept and itself will need optimisation based on feedback. But it's a significant step forward compared with "standard occupancy" in SAP.