According to ACPO (association of chief police officers) guidelines and the Anti-Terrorism Laws the police cannot prevent you taking a photo unless they have clear reason that is connected with a crime. Further they can not seize/interfere with a camera, memory card or film without a court order. This could easily been seen as interfering with / destroying potential evidence.
I'm just an amateur photographer of 36 years experience an I'm fed up with recent changes in police attitudes that breach my legal rights.
And I'm a biker../.
And yeah MCN SUX