The proscriber does not need to contact your
GP if you provide the medical cannabis clinic with the required medical records.
You can request the needed documents yourself by going into surgery and asking for a "Summary of Care" and a list of given medication and therapies in the last 10 years.
You can state this is for private therapy.
I am not involved with the companies themselves, however I am not aware of any contact beyond that with
GP's about an individual unless there was some cause for concern.
If you had privacy concerns it would be worth discussing them with the clinics seperately.