Unlucky travel day

Well we have made it to London but it was not easy. On our way to the airport this morning at 3:30 we got a call that our flight to Chicago was cancelled. We managed to make a later flight in just enough time to get to our London flight. The flight was fine because it had lots of empty room so we were able to spread out. 8 hours later came customs... I was apparently supposed to haves work visa. Nobody told me that! After 15ish minutes of persuasiveness the customs lady let me in. THANK GOODNESS! So no traveling outside of the UK while I'm here.