Immigration Act 1971

22 (1) A person detained under paragraph 16(1) above pending examination may, if seven days have elapsed since the date of his arrival in the United Kingdom, be released on bail by an adjudicator on his entering into a recognizance or, in Scotland, bail bond conditioned for his appearance before an immigration officer at a time and place named in the recognizance or bail bond or at such other time or place as may in the meantime be notified to him in writing by an immigration officer.

(2) The conditions of a recognizance or bail bond taken under this paragraph may include conditions appearing to the adjudicator to be likely to result in the appearance of the person bailed at the required time and place; and any recognizance shall be with or without sureties as the adjudicator may determine.

(3) In any case in which an adjudicator has power under this paragraph to release a person on bail, the adjudicator may, instead of taking the bail, fix the amount and conditions of the bail (including the amount in which any sureties are to be bound) with a view to its being taken subsequently by any such person as may be specified by the adjudicator; and on the recognizance or bail bond being so taken the person to be bailed shall be released.