In general the police are not supposed to interfere with people going about their lawful business.
But if they think that someone is loitering in a place, especially after dark, they are entitled to stop and ask your name and what you are doing. If there is something suspicious about you or the situation, then you can be arrested.
Police use this power often as a means of rounding up suspected persons and habitual offenders. The abuse of this power has often been discussed by reform committees and condemned.
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