Best Path into BB IB

Hi All,

I'm an engineer working as a sales engineer/account manager at an S&P 400 technology company in the UK. I have an MSc in engineering and about 4 years of experience. I'm 28 now, looking into transitioning into IB and looking to get a post graduate degree to help me in this process.

I've read a lot of different opinions on MBA vs MS in finance, which degree do you recommend that would offer the best chance to break into IB in 2-3 years.. Also, I'm looking at Warwick, Imperial, UCL and CASS, any of these are target schools for IB? And which would give me the best ROI (Oxbridge could still be an option but it's extremely costly , would need about a 90K loan to get there :( ).

Thanks!