The Reading Oracle store offers free zumba on Saturdays from 10-11. They offer two other classes during the week but I can't remember the names. They sounded a bit more demanding than what my Christmas tum is ready for!
Class details available in your local store. I did give the link they have for such events but it doesn't seem terribly useful as I couldn't find even Reading's stuff there.
I say free, because money-wise it is, but I guess the price paid is some awkward-ish, twerk-type, bootie-shaking zaza for real customers to watch! That being said, my baby laughed his wee head off as I demonstrated mama's shimmy crossed with the Charleston crossed with some lasso action!
Also see http://www.livemaguk.com/free-fitness-classes-with-reebok-fithub/
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