A lot of this is easy to find information. Doctors in the UK are paid by a standardised scale depending on where they are in training and this information isn't hard to find. You can find out easily how long each step takes by finding the relevant training curricula. You get standard UK annual leave allowances; the NHS might give slightly more, but annual leave is a statutory right in the UK - this is paid leave as well.
Of course there are complicating factors. While the basic take home pay you can find as per above, this doesn't account for additional pay for out of hours work etc, which can be quite extensive in some surgical specialties (and I think pretty much all will have some OOH work). Likewise for the annual leave as above the rotational nature of doctors training and rota demands (as I understand you can't take leave for night shifts for example). Also I gather in many/most surgical specialties it's more or less anticipated trainees will go in on zero days for further exposure/get more numbers for procedures and theatre time.
In terms of broader "lifestyle" this also is a) dependent on what you as an individual would be looking for (and what you are thinking is the lifestyle you want now as a GCSE student will absolutely not be the same lifestyle you are wanting as a foundation doctor and certainly will be different from when you are a consultant) and b) varies between specialties. Some surgical specialties may have more OOH/on call commitments than others (generally ones that mainly deal with emergency surgeries/emergent conditions are more likely to have to go in out of hours while on call, while those that mainly have elective procedures may be less likely to need to go in out of hours).
But in general, broadly pay working in the NHS is going to be essentially the same for any surgical specialty as you're paid against the same payscales - the only differences will be for out of hours pay (which can vary a little but not enough to significantly change the picture between surgical specialties I gather), and potentially the London pay allowance if working in London. Equally at least during training surgical specialties will generally have a high demand on your time and you may realistically struggle fitting in much other stuff around that.
Regardless, you won't even begin surgical training until at least after completing the medical degree (5-6 years) and the foundation programme (2 years) during which you'll be working across the whole of medicine. So you need to be motivated for medicine in general first and foremost. The surgical commitment comes later (either in medical school or in foundation, depending). The path up until that time is the same and at least up until you are in medical school you'll be doing exactly the same things as for any specialty. And once you actually finish medical school you will have a) probably a better idea about a lot of the details above and b) likely have different priorities in life anyway.