From what I have gathered in about 5 minutes of research quite a few unis do not specify which A levels you need. However it's good that you did do maths as well as English because then you will have a strong mathematical basis and you'll be able to write great essays. Id definitely advise taking both of these to A2, it'll make you seem quite an "all rounder"
Since the courses aren't specified and you wouldn't take the Further Maths to A2, I wouldn't say you need it. If you want to do it just because you feel like it, go ahead but I doubt it will make much difference other than maybe improving your maths skills a little.
Also have you had a look at a course at York, BSc Accounting, Business Finance and Management? Seems like it would prepare you very well for your chosen career. The entry requirements are AAB.