Thanks to a good friend and fellow yoga teacher who saw this article and sent through to me!
Whilst we're not running specific therapeutic yoga classes just yet (watch out for news later in the year on this one!) anyone who has more severe mobility problems can still do yoga!
Take a look at this article:
http://www.sparkpeople.com/resource/fitness_articles.asp?id=1822#_a5y_p%3D2363643