Need a new oil cooler.

Where is best to get on ?

You have probably bought one now!! Lets hope you bought a Setrab or a Mocal brand!

As opposed to the coloured shiny ones from China on Ebay!

Was going to stick to Mocal but just wanted to know best source in UK to order one. 

Mocal are quite well supported, Demontweeks, Merlin and I think even Zcentre sell them. Merlin Motorsports have been helpful when I’ve purchased bits from them in the past.
 

The stock oil cooler system isn’t the best tbh, as it (as I’m sure you’re aware) works off oil pressure rather than temperature. That said, I’m sure the stock arrangement will be more than adequate for you. 

Not used stock cooler for a long time, but due to my engine failure i'm not risking putting the old cooler back in.

What did you have before 16 row or similar? 

mocal 16 row i think, was perfectly fine but cant remember where i got it.

As the previous engine failed i had metal filaments going through the system.

So i was going to get a new rad rather than take a chance of hosing the old one out.