This practical guidance relates to the Procurement Act 2023 regimeThe main provisions of the Procurement Act 2023 (PA 2023) entered into force on 24 February 2025. In-scope procurements must be carried out under PA 2023. Procurements started before PA 2023 came into force remain governed by the previous legislation (the Public Contracts Regulations 2015 (PCR 2015), SI 2015/102, the Utilities Contracts Regulations 2016, SI 2016/274, the Concession Contracts Regulations 2016, SI 2016/273, and the Defence and Security Public Contracts Regulations 2011, SI 2011/1848). For background reading on the previous regime, see Practice Note: Introduction to public contracts procurement—pre PA 2023 [Archived].This practical guidance focuses on public procurement under PA 2023. For background reading, see Practice Note: Introduction to the Procurement Act 2023—PA 2023 and Checklist: Procurement Act 2023—key changes. For details of the transitional arrangements, see Practice Note: Procurement Act 2023 transitional and saving arrangements—PA 2023.What is mixed procurement?Mixed procurement occurs when a contracting authority needs to procure a combination of goods, services and/or works within a single contract. This can often present a