Cabinet Secretary: ministerial direction
Local copy of Letter_from_Cat_Little_CB__Civil_Service_Chief_Operating_Officer___Cabinet_Office_Permanent_Secretary__to_the_Prime_Minister.pdf
Local copy of Letter_from_the_Prime_Minister_to_Cat_Little_CB__Civil_Service_Chief_Operating_Officer___Cabinet_Office_Permanent_Secretary.pdf
https://www.gov.uk/government/publications/cabinet-secretary-ministerial-direction
seen at 18:42, 16 February in News and communications.