Remortgage but may move abroad

Hi all,

I'm currently looking at remortgage possibilities for my BTL flat. I would like to go for another 5 year fixed deal. However, there is a possibility that we could emigrate in the next 5 years. Will this be a problem? Can I maintain a standard BTL mortgage if I move (I would not be intending to sell the flat) or would I have to move onto a different mortgage as a non-dom and pay the ERC?

Many thanks for your replies