This group of amendments and new clauses is not new. It was proposed in similar words in the most recent immigration Bill by, I think, Mr Davis, but I may be wrong. No Bill passes through this Parliament on immigration and nationality law that does not include amendments and debate about immigration detention. Perhaps, after the last couple of years, Members are more than ever acutely aware that the deprivation of people’s freedoms is keenly felt and should not occur without evidence as to its necessity.

We are talking here about the deprivation of liberty not because people have committed a crime but, essentially, for the convenience of the Home Office. The new clauses contain measures to end what is indefinite detention in the UK, whatever the Home Office says to the contrary, and to implement a workable system that ensures detention is used only as a last resort to effect lawful removals from the UK. That is what the situation should be. The existing power to detain without prior judicial authority would be retained but there would be important safeguards: a 28-day time limit, judicial oversight by way of bail hearings after 96 hours with clear criteria for continued detention and re-detention only when there is a material change in status or circumstances.

Immigration detention has declined over the last several years, which is very welcome. Nevertheless, there is no release date for immigration detainees, which is incredibly severe, particularly in terms of mental ill health. Although numbers have been falling, the length of time that people are detained has not fallen. The fact of falling numbers does not reduce the need for a time limit. We are talking about several thousand individuals leaving detention every year who have been detained for longer than 28 days and hundreds who have been detained for more than six months. In a minority of cases, detention lasts for years rather than months.

Why 28 days? It is not a number that has been pulled from thin air. It is already in Home Office guidance, which requires caseworkers to consider whether removal is imminent and goes on to define imminence in the following terms:

“Removal could be said to be imminent where a travel document exists, removal directions are set there are no outstanding legal barriers and removal is likely to take place in the next four weeks.”

This is a recommendation that has been made by many organisations with expertise in the area, including the Joint Committee on Human Rights, the Home Affairs Committee, the Bar Council and the all-party parliamentary groups on refugees and on migration.