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]