Stores in the uk are generally a fair bit smaller and it doesn't astonish me to find out that large and presumably expensive stores aren't flavour of the month for The Company. Let's face it, small stores still have a couple of tables, someone to ask about painting etc and usually a decent range of stock. And the target customer often plays with mates in one of their respective houses or at a club anyway, so why provide a large venue for free?
I'm reminded of a shop that opened up here; had ten or so wargaming tables, stocked most systems. Very helpful, would talk to you for hours about tactics, painting, whatever. But was no where near as successful as the little GW down the road with a grumpy manager and an apparent dislike for letting people play. The big store was just a low cost play pen for big kids: people did major shopping online or at places offering more money off.
GW need stores for exposure an to get new punters hooked, not to provide long term support. That's what we all go to clubs and sign up to BOLS for.