I think you can forget any attempt trying to relocate players AND their houses. People get very much attached to their virtual pixel homes. Most people just do not want to risk being worse off after a move, beside from investing a lot of work of moving, redecorating and house hunting.

That's why I think the best way would be to move to a NPC town because the buildings there don't advantage or disadvantage anyone. People can keep their current houses, wherever they may be. Also nobody is "owning" the place: i.e. nobody gets special treatment because they can control guild-only doors, have access to storage or can change whatever building they want. Everyone is on the same terms in a NPC town.

Britain would be indeed nice, but even on Cats, where RPing in NPC towns was pretty big, nobody ever managed to successfully run a Brits guild (just too much 3rd party interference to spoil immersion).

Yew was also on Cats the #1 place, simply because of all the available housing space and with 2 hangout spots for evil characters (Orc Fort area & Yew Crypts).

Second favorite, just as on Europa, was Trinsic. Skara Brae and Jhelom were also fairly popular because there weren't many non-RPers there.
Jhelom was pretty nice to RP. The town is very big and PvP is a lot of fun there, especially the fortifications around the 2 Docks are very nice for city warfare and sieges. There are also 2 other islands available, so you're not running into each other all the time, if you need some privacy for guild only events.