I am not sure if this is going to be any help. I heard that Sylvia Sykes was going to over in London for this years London Balboa Festival. I went to look for their website so I could post a link for you but I can only find the website for the 2008 event. This event stated that there would be no lessons for beginners.
However the website does have some links to UK events and organisations that may be of help to you.
http://www.londonbalboafestival.co.uk/
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