A lawyer who filed Hamas’s challenge to proscription in the UK was recorded by police as being a member of the banned group, “equating him with his client”.

On a risk assessment form, a detective inspector, who authorised the detention of Fahad Ansari under the Terrorism Act on his return from a family holiday in Ireland, wrote “Hamas” in the space reserved for “membership of a known group”.

Ansari is challenging the stop at the port of Holyhead on 6 August last year, claiming his detention and the processing of data from his phone containing legally privileged lawyer-client communications were unlawful .…