So there are several options
1) Get a science A-level (Physics, Biology, Chemistry - it doesn't really matter. 1st year they know some students have one but not the others, so they start with physics and anatomy teaching as if you didn't have the relevant A-level)
2) Do an access to healthcare course
3) Do a foundation year at uni first
4) See if you can get in through clearing
I know radiographers who went through each of these routes. Check your uni entry requirements, speak to the recruitment lead, go on an open day.