And I would like to know how it is in London particularly. I have often heard that they don't matter and thats what one would think but I found this from the Imperial Colleges websites:
"Whilst there are no specific ‘A’ Level criteria for admission to MSc Finance, you should be aware that many banks and companies in the financial sector do have very strict grade requirements for their graduate programmes. Therefore, we strongly recommend that when you are considering your career options, you research the entry requirements of any companies you are interested in working for."
My A-levels (or what ever my countrys high school end exams are called in english) are rather bad but after that I have had perfect grades in every course possible at the uni. Thats because my motivation is so much better at the university than it was in high school. So I'm little worried that my high school grades will hurt my chances to get into finance.