No one knows of a reliable repairer of PGMs (IV or otherwise) in the world, if you have any luck finding one please let us know, otherwise it's Yahoo Japan and Okshon for you, they go for around £150 c/w std and maybe HRC cards + get it here and Okshon pants down charges which won't be too horrific as it's only small, but any problems will be pretty much unsortoutable (real word).
Or of course Honda for a new one...............part number is 30405-KV3-306 (thats c/w card by the look of it....) they were £350 in the 90's in Japan
I've never seen one on Ebay, Apex did have one in, they wanted a lot for it (around £400 I think).
So double check and make sure it's the PGM.......
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Please do not PM me technical questions, if you can't find it on the Forum start a thread