only if your towing more than 1ton
Wrong!
You need a B+E license. You have to take a test to get this unless you passed your test prior to 1997.
If you have a SMALL car trailer, such as a Brian James clubman or mino max these have a MAM (maximum authorised mass) of 1500KG and 1300KG.
To tow without a B+E license, the MAM of the trailer must not exceed the unladen weight of the towing car.
So in our case you need a towing car that also weighs 1500 or 1300 respectivley (Unladen weight).
Both together must NOT exceed 3500KG MAM. (The MAM of the car is another figure! Not to be confused with unladen weight)
It's recommended that your trailer MAM does not exceed 85% of the cars unladen weight also. But that's just a recommendation.
Basicaly they make it extremely difficult to get the combination right in order to tow without the E lisence.