As an hgv petrol tanker driver , as i believe ,please dont quote me but ,the law changed recently so all new drivers must take a practical driving test if they wish to tow a trailer(i have seen these "trailer" driving schools about).If you passed your car test before a certain date (sorry not sure exactly but it is recently)you can tow a trailer or caravan on what is known commonly as "grandads" rights.If you do tow on a car licence you are only covered up to the maximum gross vehicle towing weight eg a 1200 kg car can only tow up to its max combined towing weight which varies as to whether the trailed combination has brakes or not.
if you drive a land rover with a "braked" trailer this can be in the region 3 and a half tons upwards,BUT if its weight exceeds over 3.5 tons then you MUST have a tachograph fitted !! It sounds complicated but if you want real complications, try taking your ADR hazard chemical licence then take 3 weeks training to qualify as a petrol tanker driver...my brain hurts

the best way is to check is to ask somebody like VOSA they know the law inside out ,hope this helps .I just thank god im one of the lucky ones who doesnt have to worry about towing a c/van,im a class one hgv driver with a full bike licence too
