For the millionth time

Is pursuing a MSc Finance in London from a target/semi-target school a sound choice? 

Context: 1 year experience in a back-office role in an SEA country. My profile will absolutely land me in a semi-target finance programme in the UK (UCL, Warwick), but I will take 1 more year to enhance my profile + obtain front-office experience and try to get into LSE or Oxbridge. My goal is to get into BB/Elite IB in London, and am not really open to work elsewhere (don't judge). Money is something to consider but not a huge barrier.

Of course a PG degree itself it not sufficient, I would still need to network and be proactive. But would a Master's enhance my employability in London, especially if I couldn't get any banking experience under my belt? I've heard that without prior experience, pursuing a PG degree even from a target school is not as impactful as many think.