Question to the Home Office:

To ask the Secretary of State for the Home Department, what the average time taken is to process an individual arriving at a UK port or airport from (a) within the EU and (b) outside the EU.

The Migration Statistics Quarterly Report (MSQR), which provides a quarterly summary of long-term international migration statistics, includes data relating to general refusals at the UK border.

https://www.gov.uk/government/publications?departments%5B%5D=border-force&publication_type=transparency-data