Hey
I have seriously looked into this myself. The best thing to do is get in touch with the admissions officer of the uni you are interested in, they will be able to tell you exactly what their requirements are as sometimes they differ, especially for mature students.
You will almost definately need the 5 GCSEs or equivalent. Some also ask for an AS or A level in Biology or the post qualifications such as radiography as an alternative.
It was explained to me by one uni that although I was welcome to apply with my current (lacking) grades, I would be unlikely to succeed just because of the amount of competition. Portsmouth for example only takes on around 16 students a year through UCAS applications for their hygiene and therapy course and there are a lot of people wanting a place!
Hope this helps.
xx