Gradual Des: very amusing, although BA require each club within Northern Europe.
Seriously, think about what BA want: Team-players, leaders, good people skills, being able to cope with difficult problems, etc. To pass the course, you'll need to demonstrate you need to have done well in exams (since there's a few), be able to pick yourself up when the going gets tough, motivated, and being able to take feedback. Those people who can DEMONSTRATE they have done these sorts of things is what BA are looking for. People who have done school clubs, been prefects, led school teams and contributed to their schools and Universities will be a better bet to be able to demonstrate those things to BA. (or indeed been in careers where this is evident)
Having had some exposure to flying is a guide: at least if you've had a trial lesson you know you're not scared of it!
So simple when you stand back and think about it.