I have been working in investment banking for 3 years now. The following are the most widely represented universities in front office roles, according to my experience.
Oxford, LSE, bocconi, imperial, warwick, HEC, some french schools like ENS, etc.

I am a graduate of bath university's MSc Finance program. I don't have much experience in continental Europe but assume that these universities are targets for continental European banks too.

[Edited by ib201 on Jun 12, 2017]

I am not sure if you have a question but look at the FT ranking for post experience masters in finance. London Business School should be top of your list.

Are you looking to do an MBA? The LBS program is also worth considering.