I don't think I could make that judgment call for someone else...it depends where you're coming from. 50k, when considering the long ride, is not an insurmountable amount of money, but it is still debt and will rack up interest like the rest of your debt.
I personally chose a school that'll be about 40K more expensive than another choice I had, for a variety of reasons I felt were strong for me. But I also have minimal other financial responsibilities (no mortgage, no kids, no car payments, etc) and have no desire for that to change as I move into repayment time. That 40K won't be as much of an impact for me as it would be under other circumstances, and so it was worth it for me.
Other people's mileage may vary, and that's perfectly fine. You need to decide whether it's worth it in your particular situation, and if there are things at UK that you feel you really wouldn't be able to get at UL.