The Government Says

Accelerated houseblocks delivery programme addendum to PBC3: summary business case

Accelerated houseblocks delivery programme addendum to PBC3: summary business case
Local copy of ahd-programme-business-case-3-addendum.pdf

https://www.gov.uk/government/publications/accelerated-houseblocks-delivery-programme-addendum-to-pbc3-summary-business-case

seen at 11:31, 26 October in Transparency and freedom of information releases.