“i) The Secretary of State must intend to deport the person and can only use the power to detain for that purpose; ii) The deportee may only be detained for a period that is reasonable in all the circumstances; iii) If, before the expiry of the reasonable period, it becomes apparent that the Secretary of State will not be able to effect deportation within that reasonable period, he should not seek to exercise the power of detention; iv) The Secretary of State should act with the reasonable diligence and expedition to effect removal.”
“I cannot see how it can conceivably be said that pursuit of the possibility of prosecution under Section 35 can justify the Claimant's detention. The first principle set out by Lord Dyson in Lumba was that the Secretary of State can only use the power to detain for the purpose of deporting the person concerned. If the true purpose for detaining him was to prosecute him under Section 35, that was not a lawful exercise of the power.”