If there's any way you can possibly get a MFL to GCSE standard before applying to uni, I reccomend it. Given the competitiveness or the modern (and extremely international) world, having another language, even if its not specifically asked for, is an immediate bonus. It also illustrates your ability to learn. If its not practical, then concentrate in other areas as you're already fairly close to uni. I had to learn French and Spanish in school, and am now fluent and decent respectively, and although the lessons bored me to tears (until a certain stage was reached, then its just easy fun), I would never go back and unlearn them, as they've been a great help in many areas.