Thats very wise of you. I have quite a few

premium bonds and regularly win £100 or more a month. Still waiting for the big one though
With regards to paying off your loan it obviously makes sense not to take more than you actually require, because you will only piss it up the wall and then be regretting it when trying to pay it off.
The repayment methods in England are just stupid. I think you pay off something like £5 a month which I dont think really covers the interest - which by the way will be more than you think it is. A word of warning for you all.
The students loans company are crap at what they do and will regularly get things majorly wrong. Like over charging, charging tax twice and some other crazy stuff.
I was lucky and won some money which allowed me to pay it off in one big lump. However they ended up paying me money (£200) because they also got that wrong too.
My advice, pay it off as early as you can. And keep pay particular attention to what you are paying. Easier said than done I know but if not you will be paying it back forever. Oh and good luck getting through to the Student Loans Company in Glasgow. Im sure they only have one phone and it must be a payphone in the street or something because noone ever picks up.