We were living on the Island when my husband was diagnosed nine years ago. We left four years ago but up until that time found the support very good. My husband had a neurology appointment every six months and we also had the support of an excellent Parkinson's nurse. After we left that nurse retired but she has been replaced. If you look at the web site for St Mary's Hospital IW you can see the services that are provided.
There is also an active Parkinson's support group. We made many friends there and appreciated their support.
The Island is a beautiful place and we lived there and were very happy for 17 years. I wish you good luck with your move and hope you enjoy your life there.