I meant to respond to the Kelvin bit, as well, but got side-tracked with funding woes... Oh well, it will have to be another comment; hopefully wiseheart will forgive my wasteful ways! ;-)
Do I take it from your comment about Kelvin that you studies in Cambridge? You saying that you have a BA in Natural Sciences, made me think this was likely; one of my colleagues here at Queen's did his degrees at Cambridge and he has mentioned how you don't actually apply for a specific science subject, but rather do natural sciences with some specialisation. I think this is a more sensible way to do university courses; students often don't know what to expect from a university degree in say physics, so giving them the ability to change their minds without having to start over seems very useful to me.
no subject
Do I take it from your comment about Kelvin that you studies in Cambridge? You saying that you have a BA in Natural Sciences, made me think this was likely; one of my colleagues here at Queen's did his degrees at Cambridge and he has mentioned how you don't actually apply for a specific science subject, but rather do natural sciences with some specialisation. I think this is a more sensible way to do university courses; students often don't know what to expect from a university degree in say physics, so giving them the ability to change their minds without having to start over seems very useful to me.