“(a) to enable the name of the person in question to be ascertained (in the case where the constable does not know, and cannot readily ascertain, the person’s name, or has reasonable grounds for doubting whether a name given by the person as his name is his real name); (b) correspondingly as regards the person’s address; (c) to prevent the person in question – (i) causing physical injury to himself or any other person; (ii) suffering physical injury; (iii) causing loss of or damage to property; (iv) committing an offence against public decency (subject to subsection (6)); or (v) causing an unlawful obstruction of the highway; (d) to protect a child or other vulnerable person from the person in question; (e) to allow the prompt and effective investigation of the offence or of the conduct of the person in question; (f) to prevent any prosecution for the offence from being hindered by the disappearance of the person in question.”
“An officer who believes that it is necessary to interview the person suspected of committing the offence must then consider whether their arrest is necessary in order to carry out the interview. The officer is not required to interrogate the suspect to determine whether they will attend a police station voluntarily to be interviewed but they must consider whether the suspect’s voluntary attendance is a practicable alternative for carrying out the interview. If it is, then arrest would not be necessary. Conversely, an officer who considers this option but is not satisfied that it is a practicable alternative, may have reasonable grounds for deciding that the arrest is necessary at the outset ‘on the street’. Without such considerations, the officer would not be able to establish that arrest was necessary in order to interview.”
“(i) that the constable actually believed that arrest was necessary, and for a [s.24(5)] reason; and (ii) that objectively that belief was reasonable.”
“To require of a policeman that he pass through particular thought processes each time he considers an arrest, and in all circumstances no matter what urgency or danger may attend the decision, and to subject that decision to the test of whether he has considered every material matter and excluded every immaterial matter, is to impose an unrealistic and unattainable burden.”
“The decision to detain the Claimant at the police station is a separate decision to that to arrest him and the detention that follows as a consequence. The decision to detain is taken by the Custody Officer under section 37 PACE. Similarly the Custody Officer must have been satisfied that the Claimant’s continued detention was necessary pursuant to section 37(2). The reasons for continued detention are recorded as being ‘to obtain evidence by questioning’ on the ground that the ‘interview [was] required to establish facts’. For the same reasons as outlined above it was not necessary to forcibly detain the Claimant to interview him. There was every reason to believe that he would co-operate with such a procedure and no reason to believe that he would not.”