The Housing Grants, Construction and Regeneration Act 1996 , the Scheme for Construction Contracts (Scotland) Regulations 1998 and the standard form building contracts have specified timescales for payments; for the issue of payment notices, which are mandatory; and for the issue of pay-less notices in advance of the final date for payment. When you overlay those on to the drawdown dates for trying to extract money from a project bank account, the timeline becomes quite complex.