I didn’t know it had to be approved by anyone other than a consultant, my consultant told me I had to choose which one to go on, a week later I spoke on the phone to a nurse who said she would get the prescription raised and collected and within a couple of weeks I had delivery, then a couple more weeks before the nurse came to show me how to use it (admin mix-up else that would have been quicker). He may well have had it approved already though I suppose as I went after a MRI which was about 2 months before the appointment. Who knows what they do behind the scenes?!
Hope yours gets sorted soon.