If you are talking about an Alloy rad with plastic header and footer tanks then go to Advanced Radiators in Newcastle they do a brand new one complete for around £41 plus VAT which works out at less than £50 all in.
Their number is 0191 267 3312 and they are top blokes too. They fixed my race car radiator for next to nothing and really know their stuff.
Yeah they are the slightly larger ones, there are a touch taller and have a couple more rows of cooling fins as far as I can remember.
My dad fitted one to Julio and the gap on the passenger side that had been made for the standard radiator had to be extended as the alloy rad was too tall to fit in the gap.