I think this "right", as exercised by the Police in question, is a recent addition to the Community Policing Initiative. It is enshrined in Law below the paragraph that authorises them to fill your head with bullets if you look even slightly swarthy and dare to break into a trot within 2 miles of a Tube Station (e.g. Stockwell), and above the paragraph that allows them to stop and search you for walking on the cracks on the pavement.
HTH
HTH
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