I am wondering if you have fully explored all the NHS provision?
We are in Yorkshire and our Parkinson's Nurse referred my husband for speech therapy.
We waited quite a while for an assessment but are now on the waiting list for a 6 week course with other PWPs.
My husband's problems are lack of volume and hesitation.
If he had worse problems we would have been seen sooner.
If you haven't a nurse you can ring the speech therapy dept at your local hospital and ask how you can be referred.
Some allow self-referral.
Don't rush to spend on private treatment until you are sure there is no NHS service.Good luck!