It was mentioned further up thread, but I'd encourage people to take a look at working in IT. Even with a recession looming, there are still jobs being advertised
Forget about getting into Google at day 1 (you need to know a lot of computer science / algorithms) but there are plenty of online vendors which will teach you the basics of Java or Python as well as a ton of other things that take your interest - reckon on maybe 3 months practice with fees well under 1,000 pounds... of course you need your own PC, reliable Internet and being willing to put in the time practising as well. From there, your initial gig might pay 30k, but that kind of money is just for a 'foot in the door' job to build credibility... after 12 months of learning more in the evening you then move to a better gig
I looked at the 4 year post grad medicine option many years ago... it only works if you are under 35, can pass the (demanding) science entry exams and have a year or more healthcare experience - either as a volunteer or professional. 4 years gets you to the level of junior doctor - a few more years to qualify as a GP, or even more to be a consultant
Law is another option - but the UK has a surplus of solicitors (lots of work is done by non-lawyers now - just need a lawyer to supervise) and legal aid cuts has trashed the livelihood of many barristers