Copy and paste from
https://www.gov.uk/guidance/new-rules-f ... utumn-2021
Licences issued before 1 January 1997
You are not affected by the changes if you passed your car driving test before 1 January 1997.
You’re usually allowed to drive a vehicle and trailer combination up to 8,250kg maximum authorised mass (MAM). View your driving licence information to check.
You’re also allowed to drive a minibus with a trailer over 750kg MAM.
MAM is the limit on how much the vehicle can weigh when it’s loaded.
Licences issued from 1 January 1997 to 18 January 2013
If you passed your car driving test from 1 January 1997 to 18 January 2013, you were allowed to drive either of the following:
a car or van up to 3,500kg MAM towing a trailer of up to 750kg MAM (up to 4,250kg in total)
a trailer over 750kg MAM, as long as it is no more than the unladen weight of the towing vehicle (up to 3,500kg in total)
You’ve had to pass a car and trailer driving test if you want to tow anything heavier.
Licences issued from 19 January 2013
If you passed your car driving test from 19 January 2013, you were allowed to drive either of the following:
a car or van up to 3,500kg MAM towing a trailer of up to 750kg MAM (up to 4,250kg in total)
a trailer over 750kg MAM as long as the combined MAM of the trailer and towing vehicle is no more than 3,500kg
You’ve had to pass a car and trailer driving test if you want to tow anything heavier.
What changed on 16 December 2021
If you passed your car driving test from 1 January 1997, you’re now allowed to tow trailers up to 3,500kg MAM.
Check your car’s handbook to find out its gross train weight (GTW). This is the total allowable weight of the car plus the trailer plus the load