Howard, the same can be said of all the city names we've been discussing. The OP question was why are we so inconsistent about which names and words remain true (no matter where you are) to the way a native speaker would say them and which acquire different pronunciations (spellings will follow pronunciation, generally speaking). London is definitely not pronounced the English way here when spoken in Welsh, any more than it is in Italy, France and Spain, for example - but some place names will retain their essential pronunciation no matter where you are. And it's still unclear to me at least why this is.