Do I need to complete a masters degree?

I am an Actuarial Science and Risk management student currently 8 months into a 13 month internship at a large pension fund in the UK. I have decided that being an actuary isn’t for me and I would like to break into banking once I graduate in 2022. 
 

I’m considering applying to do a postgrad in finance at Oxford,LSE, Cass etc as I feel like I’m not a suitable candidate for graduate roles at the larger investment banks. Am I wrong? If so, would it be a waste of £35000+   if I were to complete one of these masters courses?

Any help will be appreciated.