i have got a 2:1 in BSc biomedical sciences. I am this stage whether i should get a job in a company relevant to my degree or go and do a MSc. What is the best advice?

It depends what you want to do as a career, doing a masters in the same subject will not teach you anything new, in science its usually used to change between disciplines or to become more competent in a new area. Also you should ask yourself if your are willing to part with approx. £2780 just for the course (unless the uni funds you) and wait for another year before you start full time work.

Don't do a qualification just for the sake of it. It doesn't impress anyone.