Academic requirements tend to fluctuate depending on the reputation of the institute in question.
Some universities will accept BBB at A-level (or the equivalent), with others accepting only triple A's as either predicted or obtained grades.
All universities rate work experience extremely highly, so the more you do, the better your chances of receiving a place. Do not automatically presume that by 'work experience' the universities mean shadowing a doctor/radiographer. Voluntary work is just as good if not better for supporting an application.
My best advice would be to order a prospectus from the universities of interest and read over what their individual entry requirements are.
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