I know both well as I lived in North of England for years. Sunderland avoid at all costs, there is a lots of people buying there at the moment because it is relatively cheap but it is a fool’s paradise. Halifax. It is a bit bigger than Galway. Fundamentals are wrong at the moment with compressed property yields etc. Good value there too compared to other area's of the UK. However, Manchester within commuting range of Halifax has a glut of property not selling. I know of someone who bought 5 apartments on deposit with a view to shifting on when near ready to complete. The apartments are completed; he has to pay all the monies but has no interest from any buyers what so ever. He bought in a good area etc.
If I where you, I would wait for about 18 to 24 months. There will then in my view be serious value in the market. Timing is everything within investment cycles. At the moment the UK is at the top of its and there is only one way to go. If you have sterling on call you'll get at the moment 6.26% interest on it, this is a lot higher than any rental yield you will get anywhere in the UK. Patience is a virtue.