My friend, his dad is a banker and he only did GCSE's.
Worked his way up and got there, now he is planning on getting an M5 or an XKR.
Yes there are plenty of salesmen/brokers etc.. who started out when they were just 16. There are likely a fair few middle management types in operations/back office who have been there since they left school and are now earning a decent six figure sum.
Though these days a large % of operations staff will have degrees, to get into the front office at a large bank you'll generally need a 2.1 from a top uni and ideally have had a summer internship.
Depends on what area you wish to go into. I've got my first interview coming up with a very large insurance company for a job that would lead me into becoming a fund manager.
[...]Obviously having higher levels of certified education will by no means harm you, but a great deal of the guys earning big bucks don't have university degrees.[...]
Really isn't the case any more - perhaps a few of the old school broker types... but basically front office requires a degree these days.
You're interviewing for a long only fund at an insurance company? its not necessarily comparable to say sales&trading at a large investment bank or working for some west end hedge fund in terms of job requirements and/or remuneration.