People seeking to come to the UK may be refused entry because they are the subject of a one year, 2 year, 5 year or 10 year re-entry ban.
People may be the subject of a re-entry ban where they have previously breached the UK’s immigration laws by:
breaching a condition attached to their leave
being an illegal entrant,
using deception in an application for entry clearance, leave to enter or remain (whether successful or not)