In this special episode to mark World Parkinson's Day, we focus on something every person with Parkinson's can do to help in the quest to find new treatments and ultimately a cure. One of the biggest obstacles facing research is finding enough volunteers representing as diverse a population as possible, to help with studies and trials.  We also hear first hand, the emotional story of how a patient participation role has led to a new treatment that is transforming the lives of people with Parkinson's.   Joining Dr Julie Jones and Helga Macfarlane in the studio are two people with vast but very different experience in the field of PPI: Claire Bale is Associate Director of Research and Involvement at Parkinson's UK,  and Sue Whipps, a long standing patient participant along with her husband John, who has Parkinson's.