Firstly, if you wish to go into medicine you shouldn't be focusing on any one specialty or range of specialties. No matter what you have to study the whole range of medicine in the medical degree (and I gather surgery is rather light on the ground in most UK medical degrees anyway), and for at least two years as a foundation doctor you have to work in all specialties. So that's 7-8 years you will be spending do all of medicine before you specialise in any one area - and you may well find once you actually experience the area you think you want to do now, you won't like it then.
That aside, you realise that being a research scientist and being a doctor are not mutually exclusive? There are dedicated academic routes through medical training where you also develop research skills and, usually, higher degrees (i.e. doctoral ones). I gather it's also not uncommon in some specialties (medical oncology and some areas of cardiology at the least) to almost necessarily have to do a PhD anyway to be competitive for consultant posts - while that is more of a means to an end, you may find in the end you continue doing more academic work as a consultant, if you are able to negotiate such a role.
Some medical schools also have dedicated MBPhD programmes, allowing you to do a PhD "during" your medical degree (normally after your intercalation year, you essentially intercalate for 3-4 more years and do the PhD as normal then re-integrate into the clinical phase of the course). It's also possible at other medical schools in a more ad hoc arrangement.