Covonia,
You will have it beaten in to you on the first day of college that you can be posted anywhere and you will sign to say this as well! It starts at stage one and is repeated at every stage as well. In all probability the numbers game means you will be placed on area rather than aerodrome (currently a ratio of 38 area to 12 aerodrome but i understand numbers on subsequent area courses may be in their high 40's), hence you will in all likelehood be going to swanick, with a possibility of prestwick!
Salary as a trainee equates to approx £950 take home (includes a living allowance)! It rises to £18kpa approx when you leave college but are an ojti. This however does not include a living allowance so you are just as screwed financially!
After saying all that i have not met an atco who is NOT happy in either area, although there is some very friendly rivalry!