The last classes that I knew of were run by forum user treadlightly, so I'd suggest PMing her to see if she's got any running or knows of someone else running any sessions.
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Insecurities are about as useful as putting the pin back in the grenade.
We've got baby sensory and sing and sign doing 'joining in' demos at the Baby and Toddler Show at the Hilton on SUnday 13th May, plus loads of others - times of activities are going up this weekend. For more details: www.the-bfg.co.uk