Sign up to NHS jobs and Trac email alerts for BMS jobs and you'll see a constant trickle of them, its not a huge amount but they do keep popping up.
Cardiff Met's Healthcare Science is more than just accredited, with the placements you'll come out of it HCPC registered and able to work as a BMS straight away, a step ahead of numerous graduates who have just done a Biomedical Science degree who need to first find a Trainee BMS post or work as an Medical Laboratory Assistant or Associate Practitioner while doing top up modules.
The NHS commissions places on this course based on the number of new BMS they expect to need when that cohort qualify, but if my own place of work is any guide there's a huge demand for BMS. Try to do well (particularly on the placements which is where potential future employers are going to get a look at the incoming graduates), but I really wouldn't stress too much about finding a job at this point.