The Home Office and contractors operating immigration removal centres must provide regular training, at least annually, on the operation of Rule 40 and Rule 42 of the Detention Centre Rules 2001, which must include: that Rules 40 and 42 are the only powers under which detained people in immigration removal centres can be removed from association and/or located in temporary confinement; who is permitted to authorise use of those Rules and in what circumstances they may be authorised; that Rules 40 and 42 cannot be used as a punishment or solely for administrative convenience before a planned removal or transfer; and the need to assess any adverse effect that use of Rule 40 or Rule 42 could have on a detained person's physical or mental health, and to consider any steps that could be taken to mitigate those effects. Attendance must be mandatory for all staff working in immigration removal centres and those responsible for managing them. The training must be subject to an assessment.