That's fine, although for CS degrees A-level Further Maths would usually be useful preparation, and for a few courses (e.g. Imperial, Oxbridge, Warwick, UCL) would likely be reasonably be expected for you to have taken it if it's offered by your school.
FM might be useful or indeed required for a handful of very mathematical finance courses (e.g. the Financial Mathematics & Statistics degree at LSE) as well, but for most "general" finance or A&F degrees wouldn't be necessary (or even potentially all that useful).