These long waiting times are troublesome, and have been reported before. The Nice guidelines are clear: “people with suspected mild PD should be seen within 6 weeks but new referrals in later disease 2 weeks.2 And “people diagnosed with PD should be seen at regular intervals of 6–12 months to review their diagnosis.”
Of, course these are only guidelines, and of course with an over-stretched NHS there may well be neuro referrals which take clinical precedence over "mild PD". But it doesn't feel "mild" to new sufferers, I can tell you, and the strain of waiting can understandably be hard on people. Has PUK done anything on this topic?
in the meantime K3 and others try not to worry too much. If it is PD, for most people progression is slow and you'll be able to adjust. And of course you'll get loads of support here on this forum.
Best wishes for your appt however long it takes.