What car do you intend using as a tow car?
I'm in the same position as you regarding towing and only having B entitlement, I thought my only option was to do the B+E test but in actual fact I can tow the Clio legally on my current licence.
Taken from the direct.gov website;
Category B: Vehicles up to 3.5 tonnes MAM and with up to eight passenger seats
Category B vehicles may be coupled with a trailer up to 750kgs MAM (allowing a combined weight up to 4.25 tonnes MAM) or a trailer over 750kgs MAM provided the MAM of the trailer does not exceed the unladen weight of the towing vehicle, and the combination does not exceed 3.5 tonnes MAM.
For example:
- a vehicle with an unladen weight of 1.25 tonnes and a MAM of 2 tonnes coupled with a trailer with a MAM of 1.25 tonnes could be driven by the holder of a category B entitlement. This is because the MAM of the combination does not exceed 3.5 tonnes and also the MAM of the trailer does not exceed the unladen weight of the drawing vehicle
Obviously this has limitations but if your only going to be towing a clio its feasible to get a combination which complies with the rules. If you intend to tow something heavier or your using a 4x4 as a tow car then your probably as well to go for the B+E but for me I figured it was worth a bit of careful planning and then getting some practice towing before thinking about the B+E.
I have an Audi A6 1.9tdi, which weights 1480kgs unladen and has a gross of 2030kgs,
so that leaves 1470kgs, a lightweight 4 wheel trailer weighs 400kgs which leaves a towed capacity of 1070kgs. A stripped out clio will be comfortably less than that, 850-900kgs and still leaves some scope for spare wheels and some fuel etc and there's still a few hundred kgs to go in the tow car.
The trailer has to be plated with it's gross capacity so in my case this would be 1470kgs. I've spoken to 2 trailer manufacturers and they're both happy to down rate the trailer to what ever the customer wishes, it can also be re-plated back to it's design weight at a later date.