People with Parkinson’s don’t have enough of the chemical dopamine in their body and symptoms include tremors, rigidity and slowness of movement.
Experts are yet to find a cure and it is not known why people get the condition.
The latest study is being led by the Peninsula Clinical Trials Unit at Plymouth University and sponsored by Plymouth Hospitals NHS Trust and is funded by The Cure Parkinson’s Trust and the JP Moulton Charitable Foundation.
Mr Salisbury says the next big event in his calendar is the Parkinson’s UK Oxford Branches’ Christmas Concert which will include performances and readings from Ian Hislop and Commotio Choir.