I am finishing first year on that course just now, i think its more like 30 people on the course with a thousand applicants for each place. I would say the best thing you could do would be to enter some of your work into competitions and see how you go, they seem to love it if you have won something or shown some initiative in getting your work seen out in the real world. On the other hand, i never did an interview, gave them a portfolio or had particularly amazing A levels and yet they still gave me a place, makes no sense really. I would say just do as much as you can to show that you have a passion about writing and English, enter competitions, see if you can do some work experience at a publishing house etc.