I think if you are drawn to Policing and Paramedic, I would probably look up the entry requirements for universities and go from there. Perhaps attend a couple of open days, or speak to friends/acquaintances who might have roles in those career paths. I know of someone who did a degree in engineering or IT (can't remember which) but is now working in the Met Police. So, it's entirely possible. Didn't get a separate degree, but applied with his current degree.