What is the maximum permitted trailer weight when towing with a Category B licence?

What is the maximum permitted trailer weight when towing with a Category B licence? How does this change when the licence holder has categories B and E? I have been unable to find anyone who can supply a categorical, confident and trustworthy answer.

Asked on 2 May 2011 by SH, Swindon

Answered by Honest John
From Hughes Guide to Road Traffic Law for the Enforcement Officer:

Cat B: "Motor vehicles not exceeding 3,500kg MAM and not exceeding 8 passenger seats (+ driver), towing trailer not exceeding 750kg MAM (4,250kg total) OR trailer ex 750g MAM if max authorised combination weight does not exceed 3.5 tonnes and trailer MAM does not exceed the unladen weight of the motor vehicle. Holders of a full licence before 1/1/97 retain entitlement to V+E, C1,C1+E (8.25 tonnes), D1 (not for hire or reward) and DS1 + E (not for hire or reward)."

B+E: "Cat B + trailers exceeding 750gk MAM. New drivers must hold cat B licence and take a separate test."
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