"detailed general guidance" is a bit mixed, and can also be confused with the content format detailed guidance. Change to: HMT's 'Major Project approval and assurance guidance' describes the Treasury's and the MPA's process. The Cabinet Office's ['Integrated Assurance and Approval Plan'](https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/61374/MPA_20Guidance.pdf)(PDF), explains the approvals needed through the lifecycle of the project.