ritchey freehub compatable with shimano?

A mate of mine has got a Chris boardman pro hardtail, and his freehub seems to have siezed. Halfords have not been very helpful and after 3 weeks no joy. My question is are shimano freehubs compatible, if not where can we get Ritchey spares from?
Or any shared experiences would be welcome.
Or any shared experiences would be welcome.
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as boardman are only available fron Halfords they should be the place.
But as Ritchey are a wider brand than that you could take the wheel to any LBS and see if they can help.
Parktools :?:SheldonBrown
A Deore / XT hub may well cost less than a Ritchey freehub body, who knows - will make up for the fact that the wheel will have to be re-laced.
Then took a trip down to our LBS. He took a look at the hub and said that's not a Richley freehub. That's a Formula Freehub, got one on the shelf #23. Job sorted
So who knows? But the fact is if anyone else has a problem with their Boardman hardtail freehub this experience may help?