Radiator for a 84 van diemen

So I'm asking around for a radiator for a 84 van diemen because as I understand it the radiator in my FF is very large for what I going to use the car for (for the CM class in autocross) I hear that the radiators from the UK where smaller. So if anyone would have a UK style type radiator for sale or would like to trade my US style radiator (looks like a 3 cores type) for a new to great condition UK one would be great.



Or!? turn me in the right direction shop wise, Thank you



Ben