EIM42870 - Residence or employment in the United Kingdom: employees arriving and departing

To decide whether you can deal with the case yourself or if you must submit the case to CAR Residency (Residence & Domicile Technical Team) Bootle:

for someone coming to the United Kingdom, obtain a completed form P86 in accordance with EIM42890 and the Residence Guide (RG2.2) and see RG2.3 onwards
for someone leaving the United Kingdom, obtain a completed form P85(S) or P85 in accordance with the Residence Guide (RG1.2) and see EIM42930 onwards.

Retain and store the forms in accordance with the relevant procedural guidance.