I am reluctant to have the jab, as I've heard horror stories about reactions, ( blood clots, embolisms, heart problems and infertility in the young)
As I think it's only a matter of time before the NHS refuses to provide ' non jabbed people' with insulin…
I am not sure if you heard them too, but I heard a lot of horror stories about the reactions of people who caught Covid. Even those who had no at the time symptoms have had health problems. And loads of them died.
Anyway, the very worst most despised criminals, the sort who do cruel things to children with no remorse, are not denied medial treatment necessary to keep them alive. Why do you think you will be any worse?
With all due respect, you are thinking too highly of yourself if you think the government literally want to kill you. Not that I think much of the government, but if they were to start imposing death sentences, there will be a lot more people ahead of you and other unvaccinated people on the list.
At worst there may end up being a two-tier society where people who refuse to be vaccinated are denied access to cinemas etc. But for a long time that has often been the case for the minority of people with disabilities, and that was due to no choice of their own.
The vast majority of people do support being vaccinated, not just for themselves but for those with whom they come into contact, and to stop the spread of disease more widely. So if they do not feel safe being around people who could be carry a fatal disease, preventing you from entering the same spaces as them, that is their choice to make. Every bit as much as it is your choice to make to not be vaccinated. But no one is going to kill you for it.
That all said, if you really are refusing to listen to anyone who disagrees with your position and to consider it from a different perspective, then the answer is simply that you do not have to use the N.H.S. to get healthcare in the U.K. Everything you can get for free you can also get by paying money.
Private clinics also offer G.P. services, and their doctors can also issue prescriptions. Unlike an N.H.S. prescription those are not free (nor subsidised, as for most non-diabetics in England). You have to cover the cost of the medication as well as the fees for having the prescription issued (to the doctor) and dispensed (to the pharmacist).
For insulin it is around £40 (rapid acting) and £60 (long-acting) for a pack of five pens or cartridges, before fees. The doctors are also still professionals and will not keep issuing prescriptions without review, so you would also need to budget for regular consultation fees too.
That is the only way to legally get insulin in the U.K. without using the N.H.S. Otherwise you need to know some dodgy people or use dodgy web sites. But if you are worried about the side-effects of the Covid vaccines, which are no worse than for any other medication, then you would not want to read the horror stories of people who bought unregulated and quite possibly fake drugs.