Such a good question. I think you would have to start emailing banks abroad and asking. However, I think it's very unlikely that they will allow a loan when your address is outside the country, because they wouldn't have jurisdiction in England, should you refuse to pay it back. But there is always ways around this. Your best option is to actually contact each bank individually and see what they have to say. I must say, hats off to you for thinking about this. Good luck!
EDIT - A way around this, for example, would be to actually rent a property abroad, and then ask for money saying you would like to invest abroad. Once again, good luck!