Collected the re-cored radiator from CPA Services on Tuesday - they're located on the Alma Park Industrial Estate, Grantham, Lincolnshire NG31 9SE.  Must admit I'd never heard of them before - they've only been there 30 years after all!  I'm impressed with the job they've done, and the cost.

Just need to check out the existing hoses now before I re-fit the radiator.  Although I've seen some nice silicon hoses on the internet in British Racing Green.  I'm tempted, but its a 2 month delivery period - seems everyones getting their Caterham sorted for Summer!