Commenting on this, Greg highlights: "The sheer scale of investment represented by the plans, with spend on the enhancement programme more than tripling on the sewerage side between AMP7 and AMP8. That appears to be sustained, if not growing, through AMPs 9, 10 and beyond." Liz explains: "If this magnitude of expenditure was to be approved by Ofwat it would pose questions about both the affordability and the deliverability of the plans.