Jono - 80% is less than 100%
100% is Gross Market Rent or GMR which was £164.55 pw when original figures produced for illustration.
At the same time:
Council rent of £71.14 is 43% - hence AR is an 85% increase
HA rent of £80.11 is 49% - AR is a 64% increase
Regulated PRS rentt of £79.45 is 48% - AR is a 66% increase
(Unregulated) LHA of £113.74 is 69% - AR is a 16% increase
All of the above are LESS than the comparable AR social housing renting model (ie ones thats covers benefit payment) of £131.64 which is the 80% figure.
3.11 of the Affordable Homes Programme Framework document - the official guidance - says that the 80% figure cannot be used where it exceeds the HB caps