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I'm looking around to see if I can find where I stashed the link, but IIRC, the only shark fin type I'd seen was a Sat/XM antenna that people were bringing in and adapting from a VW Golf.
I'm pretty sure the Clubman uses the same antenna as the R56 but I think you're out of luck if you want a plug&play shark fin antenna. If you're satisfied with your radio reception with the screw in antenna completely removed (just the black housing in place), you can always create your own shark fin antenna by disassembling your current antenna and just keeping the electronics pkg in place and covering it up with one of the many fake shark fin antennas available. You'll need to take off your current antenna and then disassemble it to determine how big a cover to look for.