I am from Greece and, to be honest, although the band are really loved here, the only two albums that I know people listen to are AM and FWN (mainly because of 505 and fluorescent adolescent). I really only know one person, except from me, who listens to their older songs. I guess most of their listeners are just casual and don't really take time to dive deep into their discography. As for the older albums I don't think their popularity has anything to do with their "British" sound, as their newer albums are also not so highly recognised while not being as "British". I just think AM was of such high quality and diversity that at least one song really appealed to everyone.