I'm in the midst of another week of sleepless nights, and the thought suddenly occurred to me that I may have trouble proving when I took up residence in the UK. Since I have both a US and a UK passport, I always enter the UK w/the British one and enter the US w/the American one, so neither passport gets stamped as I travel back and forth between the two countries. I'm thinking that at some point I may want to go back to school, so how do I prove I've met the residence requirements for tuition purposes? Driving might also be an issue, as I don't know how to show when the 1 year I'm allowed on my American drivers license begins/ends. Have I created a problem here or what?