The job is within local government and it has a list of essential and desirable criteria. Maths & English GCSE A-C or equiv is essential. I don't have Maths, I only got a D (and this was 25 years ago). However, I think that my work experience and further qualifications during my career prove that I can easily do the job. And, I satisfy all the other essential criteria.
If there are a large number of applicants I am worried that my application will be discounted before they even read my employment history and experience.
Would you bring it up in the covering letter and point out the qualifications I have gained in the last 10 years (finance related). Also, I am willing to go to college to get my GCSE Maths if needed, in fact, I might just do it anyway.