Anyone here default while abroad?

I owe about 130k federal and 175k private from Sallie Mae. I plan on dealing with my federal loans by going into IBR. My private loans are much higher than what I originally borrowed due to the ridiculous interest rate. When I was in grad school I was very close to studying in the uk but my plans fell through last minute. Now I am looking at working in the uk or pursuing a doctorate. If I were to go to the uk, would Sallie Mae come after me if I defaulted? I know the uk is very similar to the us.