Need some advice on how I can be approved for hcpc

If you have a BSc in Biomedical Sciences at the University of Westminster then you don't need any top up modules. What you need is to find an IBMS accredited workplace (pretty much all NHS pathology labs) and complete the IBMS registration portfolio.
The MSc doesn't add anything at this point, although it's useful for career progression.

If you have a BSc in Biomedical Sciences at the University of Westminster then you don't need any top up modules. What you need is to find an IBMS accredited workplace (pretty much all NHS pathology labs) and complete the IBMS registration portfolio.
The MSc doesn't add anything at this point, although it's useful for career progression.

Also how long is ibms registration portfolio and do you get paid while doing it?

There is not set time for the registration portfolio, but it's unlikely to be able to complete it with less than 9 months lab experience. But 12 - 18 months is fairly standard.
As for pay... it depends. If you get a job in a lab as a trainee then yes. But it's very unlikely you'll get that post without experience as they are very competitive.
Most graduates take one of two routes (I don't agree with this but it is the system we have):
If I were you? I would look for part time work while you're doing your masters in a lab. If you're at Westminster there are loads of options. Get that work experience while you're studying and then you'll be in a better position to apply for trainee roles.

Thanks for the advice I’ll also ask my lecturer for more information when I do start uni about what other outcomes I can possible do to acquire hcpc

You don't need your lecturer. You don't have any other route to HCPC registration than completing the IBMS registration portfolio in an accredited training laboratory. There are no other routes if you are based in the UK.