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Very urgent!!!!Science foundation OR Access course

Hi.
I really need your help guys. I am in a deep state of confusion

I have just finished my Level 3 Humanities and Social Sciences Diploma on June. Managed to get distinctions and Merits University had asked for to go into Psychology degree. However I no longer wanna do psychology!! :frown:

I feel that I will do better in Biomedical sciences degree but my Level 3 is not science based.

I have checked entry requirements for Biomed and they ask for either a science based Access Course or Science Foundation year.
I am really confused about which one should I go for. Since I have already taken one level 3 and it won't be free for me any more even though I am under 23. I am also struggling to find any science foundation year in London. Could you please tell me which one is more guaranteed admission in Biomed? And how could I find a Foundation year in science.
Thank you