There is much talk about 'working as a consultant' outside of medicine in the associated fields and allied industries such as big pharmaceutical or tech companies, even the world of finance.
However, it would be unrealistic to expect you'll readily find a ready-made consultancy job outside of medicine as a graduate who is post F1 or post F2. You won't be alone in the sizeable number of people who will have had quite enough of NHS-lyfe by the end of F2. Some students I know already voice their feelings in that actual clinical practice doesn't appeal to them in the slightest and to be fair, I can understand their views completely as shift working up to 12 hours a day isn't necessarily the dream for young people who are sub 30 years of age whilst they have lots of other ideas about what is important in their lives.
The real question then is what experience does a person leaving clinical practice at the end of F2 have? The reality is that there are thousands of such people being 'generated' every year and if you have come straight from school, A levels and now University you won't necessarily have a lot of experience of the world of finance or commerce or skills that are automatically transferable. I know people who do have certain skills though. People who write code virtually in their sleep or who have worked in STEM fields already or been project managers in a previous life. The fact they have a medical degree is almost secondary to some of these achievements.
My advice then if you are genuinely serious about leaving clinical practice and going for it in the commercial or academic, etc worlds, you're going to have to have some bits on your CV outside A level and your BMBS and start emailing and talking with companies ASAP so that you have maybe an internship or similar ready for when you leave medicine. Yes, you'll have a degree and you'll be a qualified doctor but the world of commerce often revolves around how much money a company can make out of employing you otherwise, they generally don't hire people just for the lulz. Get on linked in or instagram or whatever platform people use these days and start forming connections because you're going to need them. I can tell you this with near certainty because I worked in industry and from time to time the economy contracts and companies pull their claws in and won't be actively seeking to employ brand-new people on a salary of 40K plus all the costs associated with that. You may also be required to relocate elsewhere in the world. I was offered a job by a big name (at the time ) company but it involved a transfer to North America. It was too big a step for me at the time and I declined but I mention it only to illustrate that life outside of the NHS mothership isn't necessarily greener.