Sociology is a sort after A level and will serve you well in your chances on getting a place. Although I think most rests on you getting a 2:1 in that degree, if not you need to complete an access course or biology A level or something along those lines.
You know it has become increasingly difficult to enter nursing recently... They believe degree educated nurses will be better but honestly as a nurse it doesn't make a difference.
I completed a DipHE in 2010, which is 300 credits, 60 short of a degree. However at this point you got a free bursary, of like £600 a month and only needed 5 GCSEs for entry.
There making it more difficult for people to enter even though there is a clear shortage and they are bringing in nurses from abroad, it's all so illogical.
Although you need to learn anatomy and physiology, once on the job it is more your work ethic and interpersonal skills which serve you. Doctors will often tackle questions regarding this aspect, your job will be to run wards and care for patients. That said, there are various advancing roles for those who are more academic or want more responsibility.
If you get the 2:1 or above you'll get a place in the lesser elite universities.
If you want to go to a great uni, you'll most likely need A level bio and health and social care.