Everyone should ease up on the OP, it's a legitimate question but it does show that they haven't researched the application process fully. As for the fact that she now can't apply because they posted on here...they can't apply for another five years (minimum) anyway, so posting fairly annoymously on a (pretty annoymous) internet help site shouldn't be too much of a obstacle.
They require you to have a degree with a classification of 2:1 or higher. In reality they're probably looking for certain subjects from certain universities - most likely languages, sciences, mathematics, computer science from the top 20 universities. Some degree/uni combinations will be more useful than others - if you apply with a first in Maths from Cambridge, they don't need too much further proof that you're bright.
In short A-levels don't matter a massive amount - they're a means to an end, the end being your degree. So choose what your good at, and therefore what you'll achieve most highly in. As others have said, they seem to take on a lot of bi-lingual people so learning a second/third language can't be a bad thing. Anyway, best of luck.