"It is a legal requirement that the noseweight should be 4% of the weight of the trailer or at least 25kg, whichever is the higher.. For safety you should aim for, but not exceed, the lower of the 2 figures specified for caravan and car respectively. "
That contradicts itself.
The first point says at least 25kg or 4%, whichever is the higher.
So in the above example 4% of 1300kg is 52kg, so that should be used.
However it then says aim for but not exceed the figures specified for the caravan or car.
Or am I reading it wrong and it means you would aim for 52kg, unless the specs in the car/towbar nose weight say 75kg and the caravan specs say 45kg, then you would be limited to the lower of the 2, ie 45kg.
Jimbo