Mature Student needs help with training contract



I am currently working for my father’s business and want to get into accountancy. The problem is that I have poor A-levels (220 UCAS points) although I managed to get a 2:1 from University of Southampton. I really want to get a training contract through the ACA with one of the firms listed on their website, preferably in London. However, most of the firms require 280, 300 points and the very minimum is 260 points.
What do you think the best option available is? Do you think that I should just apply anyway and see what happens or do you think it would be better to do the foundational course (AAT-ACA Fast Track) and get fast tracked (where A-level results, presumably, are less relevant)?
I should add that I am 31 years old.

Many thanks for your help.