Thanks for the link on Garth McLean. I just wanted to add that I came across Yogaglo.com - an excellent site that offers hundreds of on-line yoga and meditation classes for all levels and different durations (5-120 minutes). Did the free 15-day trial and joined - $18 (US) a month. Instructors very good - and it is real luxury to have access to yoga and guided meditation when you can't make it to a class.
Will let you know how my workshop goes with Garth McLean - and which poses he recommends for MS.