I have researched this quite a bit. It really depends on the university. A lot of unis won't take nursing, physiotherapy or chiropractic as a 1st degree entry qualification.
Some state science based only. Others are very flexible, and as previously mentioned will accept journalism, law, english etc, but usually you have to have studied A level sciences as well.
Biology is certainly acceptable, and in general most sciences. But you really do have to research the unis you intend applying to.
It's worth noting that one or two unis will take a 2:2 qualification, most ask for 2:1 but some will only accept people with a 1st class degree. So if you decide to go that route, pick something that you think you can do well in.