I'm not sure what the Lunar Archivist website was (have you checked the Wayback Machine on archive.org? Unless you mean
this tumblr which might be by the same person?), so if you're talking about a fan story I'm not sure.
But if your question is, "When was Sailor V in London during the anime", it seems she must not've been there yet during episode 1 since she's in the news for stopping jewel thieves in Tokyo, and that she's come back by episode 33 (when she ambushes Kunzite and Zoisite during their trap, when Zoisite was disguised). It seems to be, I think, Autumn in episode 33, and Spring in episode 1, and we know it was May 1992 in episode 12 from the cruise ship tickets, so Minako spent somewhere from as early as March(ish) 1992 until maybe at most October(ish) 1992 in London.
...unless Minako was in London before she even appeared in episode 1, and had already come back by then and just didn't meet any of the Sailor Senshi until then.
I wonder where Artemis was making his calls to Crown Arcade from. It'd be kind of hilarious if he was in a secret basement talking to Luna upstairs through the arcade machine that whole time, and Minako was in that next school district over the whole time, and they just never bumped into each other. (That's actually not so far from what the Sailor V Manga suggests, but of course that's the manga).