There is no specific notice period for failed asylum seekers to leave the UK.
Individuals, including failed asylum seekers, with no leave to remain and no further outstanding applications are expected to leave the UK voluntarily at the earliest opportunity. The Home Office provides assistance and advice to facilitate voluntary returns
If an individual refuses to leave the UK voluntarily, the Home Office will pursue an enforced return. They will be issued with a ‘notice of liability for removal’, which sets out that they can be removed after seven calendar days if they are not detained, and 72 hours if they are detained
Family groups are provided with greater support and advice and will be invited to attend a family return conference. The notice of liability for removal is a minimum of two weeks after the family return conference.