In its written submission, the Home Builders Federation (HBF) quoted its research which had found that at least 17,000 Section 106 affordable housing units were unsold. It also claimed that the delivery of almost 32 C&AG’s Report, para 2.11 33 Qq 14, 42 34 Letter from the Permanent Secretary, 9 July 2025 35 C&AG’s Report, paras 2.17, 2.18 36 C&AG’s Report, para 2.20 14 100,000 private homes was blocked or delayed, because construction often cannot start on a site until a buyer for the Section 106 affordable homes is found.37