The access to pumps varies by ICB (Integrated Care Board), depending on what rules are in place.
There's some research which showed patients are twice as likely to use the pumps successfully if they attend a pump clinic and have the pump demoed on them.
Some ICBs only allow prescriptions for patients who have attended a pump clinic. In these cases, the pump clinician provides a form which is used by the GP or hospital to prescribe a pump.
Some ICBs don't require attendance at a pump clinic, in which case a GP or hospital can prescribe it.
One ICB (Bucks, Oxon, Berks) doesn't allow any pump prescriptions, claiming they are not effective (which is clearly at odds with all the research and patient experience). I spent 3 years trying to get this fixed through the patient participation groups, but the patient participation group leader screwed up when we were expecting to present our case, going to some effort to ensure patients weren't involved, so the ICB didn't get to consider most of the patients. I can't tell you how furious I was. Sorry if you're in this area, but the NHS screwed it up for you.