As I'm a BBA student at Bath and currently on my second placement, thought it was only fair I commented on this and stopped you all becoming too deluded.
1. On your first placement, salaries are usually around £12 - 15K - that's for a year, so in the six months you can expect to earn between £6-7.5K (don't forget you'll be taxed though!) I worked for BMW and earned a straight £1K per month.
2. Yes, the salaries for second placements are usually higher than the first ones, but it largely depends on what you want to do. A lot people end up trying to get into the big financial institutions in London (Deutsche Bank, Citigroup etc). There is a lot of competition for these places, and only around 5 students are offered placements with them - this year infact DB didn't take anyone. These are the only firms which pay as highly as the OP said (I believe it is actually £32K so you would earn 16K). You also have to sign your life away for 6 months if you're working for these firmsand be prepared to work all night, so the pay per hour you receive probably works out about the same as other placements!! Most other firms pay second placement students somewhere around £15-17K annual salary. Where I am, I'm getting £7.5K for the six months, but it wasnt about the money for me - I wanted to stay in Bath and this was one of the only placements available here, plus I dont want to work in anything to do with finance so the big-payers didn't interest me anyway.
So, if you're all hoping to have £30K in the bank after your placements, think again! And I'd advise you all not to apply to placements just because of the salaries, it's the experience you're really there for, the pay is just a bonus.