Good UK universities? Wales?

Honestly, there is no such thing. There are a small number of places, like Iowa for example, where the amount of time it has been around and the writers that have come from there lend it a great deal of reputation, but these are increasingly irrelevant factors which contribute more to out-of-the-gate job placement than taking your own writing ability where you want to go. This isn't a criticism of those programs, mind you, but rather something caused by the growth of writing programs. As someone who has extensively been in creative writing programs, I will tell you this: the where and who of your writing education in a university is vastly, vastly outweighed by your own ability and determination to work. Writing programs are all about what you make of it, more than anything. Secondly, large programs generally suffer from not getting the one-on-one attention of a smaller school. You can go to a "prestigious" school and study under a "well known" writer and end up getting very little, and you can end up going to a small school, working under someone hardly-known, and get the best writing guidance you can possibly get. My advice would be to consider visiting some schools, meeting the writing faculty, and see which ones you feel most comfortable with.

it is a good school. also, consider king's college in london