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3. Wrong - a producer (HO/RT/1) is issued to produce documents; you are not questonning a driver to obtain evidence. If you knew an offence had been committed you would report for it not issue a producer therefore no caution is required. You do not request a person to produce documents you know don't exist.
/pedant mode on
Actually, you are wrong here John. The offence is not producing the documents at the time requested and is complete at that time. The HO/RT1 is merely a means of avoiding prosecution for said offence(s) as virtually no-one ever has their documents in the car