R (SA (Holland)) v SSHD  EWHC 2570 (Admin),  MHLO 79
'In these proceedings the claimant SA challenges his detention by the defendant under immigration powers. ... Permission was granted ... on what were then grounds 1 and 3 of the grounds of claim: that the defendant made public law errors in the application of her policy for detention of the mentally ill (ground 1) and that the claimant's detention was in breach of the Hardial Singh principles ... (ground 3). Ground 2 claimed that the policy on the detention of the mentally ill was itself unlawful. ... in the light of the decision of the Court of Appeal in R (Das) v SSHD the claimant no longer pursues that ground.'