As I read it (hence the comments on confusion...) the post 1997 rules suggest that the total MAM can be as much as 4250 kg if driving a 3500 kg MAM vehicle towing a 750 kg MAM trailer.
As soon as the trailer goes over 750 kg MAM the
total MAM drops to 3500 kg. Seems silly but one additional kg on the trailer MAM will drop the total MAM by essentially the weight of the whole trailer.
With my T32 therefore (as a post '97 licence holder) I can tow a 750 kg trailer creating a total MAM of 3950 kg within the limit of 4250 kg.
So, back to
@Andy Power and the original question. If you passed your test after January 1st 1997 you can tow a trailer/caravan with a maximum MAM of 750 kg...pretty small one that.
You haven't said when you passed so assuming your are a pre 1997 licence holder your limit will be 8250 kg MAM for both added together. However, the trailer/caravan MAM must be lower than the tow vehicle's. Therefore....
T32 (3200 Kg MAM) max towable weight is 3199 kg MAM for a total MAM of 6399 kg. This obviously falls well within the 8250 kg absolute maximum MAM. Additionally, any trailer/caravan over 750 kg MAM must have a dedicated braking system.
As I read it......