The London Ale is one of the more highly-attenuating of the "British" ale yeasts, so that should be pretty comparable to the Cali. The Cali V isn't quite as clean and dry as the 001, so I don't think you'll be too far off. You may lose a few of those British-ale yeast esters, but for a holiday ale that's already got some spicing going on, I don't think there's anything wrong with having a little cleaner yeast profile. I don't think it'll end up being that noticeable, if at all (depending in part on how aggressive the spicing is).
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