Region-locked doesn't matter to me. I've gone to region-free players. However, check Fabulous Film's website for the Blu-ray set and you'll see they list it as Region B:
http://www.fabulousfilms.com/products/387
I passed on the UK set a few years ago when it was down to about $103 + shipping...
What worries me is the entire series from Mill Creek is on 30 discs, but Fabulous Films' UK set has 37 discs. I suspect a lot of compressing.
I wonder if they're uncut original episodes or edited for syndication.