Hey,
I had the same question before I went to the Open Day a few weeks ago as I want to do a language as a floater. I was told that if you are doing Joint Honours, then you can do one floater in your second year and then another one in your third year (but not in your first year). BTW if you go to SOAS I will probably see you at the History lectures; I am doing Politics and History there next year!
Shelly