A master will not be accepted as a substitute for a BSc, you will need the bachelors degree.
I can’t really say whether it’s worth getting your degree assessed as I didn’t need to do this. That’s up to you. I would imagine with the degree you have, at the very least you’ll need a number of top-up modules as it wasn’t a biomedical degree.
And while the previous poster is correct that some labs allow the MLAs to do their portfolio, you still need an accredited degree regardless.
Hope this helped in any way!