highway code Rule 98 – Vehicle Towing

you MUST NOT tow more than your licence permits. If you passed a car test after 1 Jan 1997 you are restricted on the weight of trailer you can tow
you MUST NOT overload your vehicle or trailer. You should not tow a weight greater than that recommended by the manufacturer of your vehicle
you MUST secure your load and it MUST NOT stick out dangerously. Make sure any heavy or sharp objects and any animals are secured safely. If there is a collision, they might hit someone inside the vehicle and cause serious injury
you should properly distribute the weight in your caravan or trailer with heavy items mainly over the axle(s) and ensure a downward load on the tow ball. Manufacturer’s recommended weight and tow ball load should not be exceeded. This should avoid the possibility of swerving or snaking and going out of control. If this does happen, ease off the accelerator and reduce speed gently to regain control
carrying a load or pulling a trailer may require you to adjust the headlights
In the event of a breakdown, be aware that towing a vehicle on a tow rope is potentially dangerous. You should consider professional recovery.