1. if exposure is intended, then of course go....it will be an eye opener....

2. if working after is intended, the only way is getting a firm job offer (tier 2 visa)....and under present economic climate, and in the financial field, it will be difficult...no job, no stay.....

3. if you go on to do master/phd, then you will be a student (tier4 visa), need to pay fees, and restricted to 20hrs/week work....at the end, your chances of getting a job will likely be better, but still difficult....

4. this will cost money....so it depends on how willing you are to spend it.....is spending this money just for the 1 year experience worth it? (as you are likely not going to be able to stay on after).....only you can decide this....