Trailor laws are different now, you can't tow anything more than 750kgs, including the weight of the trailer unless you do a test and have it added on to your licence.
That isnt true.
When i looked, its worded utter shit, but from what i can tell you can tow up to the unladen towing vehicles weight (as long as its within that cars towing capacity) but overasll it cant exceed 3.5ton....
ie in theory if you had a 1500kg car, you could tow 1.5 tons. Its all bull anyway, i will just be towing my car at some point, screw the trailer test when i can get around it....
Altho the old man is thinking about getting a VW transporter flat bed for work soon, so that would make things easier