Minors (under 18) are generally not detained by the Home Office, and are only detained with family members. There are many cases, however, when the Home Office wrongly decides that a child is an adult, and detains them. Having your age wrongly decided can also have an impact on your protection claim.
When we have evidence and instructions from a client that they are minors we can help them prove that they are under 18, and so should be treated as a minor.