I'd love to go back to the UK and get to dive the various locations after getting an orientation. The UK waters are full of history and intrigue for me. It does need solid orientation to dive there however. I was told that it isn't possible to dive there many months of the year, Fall through Spring, due to water conditions. In other words, you can dive in the ocean/sea for very few months of the year. (I have no desire or interest to dive in the quarries or lakes there).
My experience with BSAC "volunteer" teaching system is that the scheduling and arranging for a set schedule or trying to start a course is a big pain because of the "volunteer" mentality. I'd rather pay money and have everything done at a more committed basis.