It is not currently possible to provide an Answer to this Question as the information requested does not form part of the national control of immigration statistics and could be obtained only by the detailed examination of individual records at disproportionate cost to the business.
Border Force Officers at ports and airports have a wide range of powers which they use to operate immigration controls and to tackle immigration-related crime. These include the power to grant temporary admission at any stage in the case consideration process. Temporary admission may be granted to passengers who cannot immediately satisfy the immigration officer that they qualify for leave to enter the UK. Such passengers may be temporarily admitted pending further investigation.
However, not all persons who are granted temporary admission are subsequently refused entry and removed from the UK. Indeed, a passenger may be granted leave to enter the UK following an initial period of temporary admission, provided they can satisfy the immigration officer that they qualify for leave to enter.