Thats not what I read! It seems to me that more people are advising to do your coursework in the UK, especially if, when you're done, you want a job in the UK. A few people seem to hold Spain in very high regards but I didnt really read where people are saying that the UK is a bad idea. Perhaps I'm wrong though...did anyone say that? There were a couple of schools in the UK that were spoken highly of. One person did all of their conversion through the MCC at CABAIR and had no complaints. A couple of people for PAT, one or two for Stapleford (which really looks good, I'd look further into that one myself).
Overall it seems like the majority is saying stay in the UK if you want a job in the UK and to be familiar with UK airspace. Do your homework and dont just pick a school for its name or for its price. Visit the school first, hear from people who attended, check the instructor to student ratio, and make an informed decision.