Hi,
That's a complicated question, and a good part of the answer is "it depends".
1. When did you pass your driving test? Before 1997 or after?
2. And does your driving licence have a B+E entitlement?
Basically if you passed your driving test before 1997 you can tow up to the placarded weight limits on the car VIN plate / owners handbook. After that date you are restricted to 100% unless you took an additional test.
However, the placarded maximum tow weight in the car handbook is the maximum permissible for a low loading trailer and not a caravan where aero-dynamic effects and a higher centre of gravity are important stability factors.
The (safe) recommendation from years of accumulated experience is that you don't tow a caravan weighing more than 85% of the car kerb-weight, unless you have a history of towing experience when 100% of the car kerb-weight is a sensible maximum limit.
Robert