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For anyone who is still interested in pregnancy yoga or antenatal classes and in the Lymm area, Lazy Daisy Active Birth classes are due to start at The White Rooms in Lymm on 1st December 2012. Special introductory rate is £40 for a six week term.
I had a look on the birthlight website but it seems the closest is Halewood which doesn't look too close to you. Have a look on www.bwy.org.uk which has an instructor search if you put in your postcode.