I changed out my rad. Made all the difference and meant I could replace the 72degC thermostat a previous owner installed (now std 88degC) and removed the overflow bottle a PO also installed. Now handles the load easily. I installed one of the 2 core "super" uk ones (3 core didn't fit, probably bent inner wing) available from your local mini parts supplier. (PS. Minis Plus may have a 3 core they specially ordered for me going at a good price )

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'78 1275 LS (Under Repair, Dependant #1's car)
'72 GT Powered Clubman (Mine)... Under (re) construction

My alloy rad is Chinese, cost about $100?, very well constructed (great welding job) but I fail to see how it will block up running decent coolant. For the hell of it I drained it last week (easy, has a neat drain plug fitted) and the coolant looked fine/ clean and it was close to 2 years old....

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67 Deluxe
Dry suspension
1293cc, 11:1 comp, RE 282 camshaft, 45 Weber, extractors etc
4 synchro close ratio gbox
Cooper S brakes, no booster
Stealth box, as Doc says "goes harder and idles!"
RH tank cos I needed it crossing the Nullarbor etc..

This rad I have was on my old motor that blew a head gasket, and some oil did get in the coolant at the time. I flushed and ran cleaner through it , but maybe it did block it up a bit.

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I wish I had some sort of witty quote in my signature