• If plod (either a constable, or in London, also a PCSO) asks you to stop, you must do so, without any reason.

    If they (a constable only - PCSOs do not have the general powers of a constable, just designated powers) ask you to dismount, they must have a lawful reason - they do not necessarily have to tell you this reason, and it may be as vague as "directing traffic".

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