Hi Francine, hope this reply isn't too late for you, but there is a lovely lady - Carmela Trappa - who works at Body Control London who teaches people with Parkinsons Disease and who may be able to help you. www.bodycontrol.co.uk for contact info. Julia
Dr Brent Anderson of Polestar Pilates offers a terriffic workshop addressing this very issue. To determine if you may be interested, you can view a video clip on YouTube . Type in "polestar Pilates for Parkinson's disease patients". Hope this helps.
-Francine