Look, I'm all for the erasure of major urban centers from known history, but I've always appreciated London as a kind of flypaper. Yes it's constantly being almost destroyed, but as long as it's there, the rest of the world is buffered.
Look, time holes are normal around here, but we cant just erase major centers whenever. we do still have to think of the fact that it is a weirdness magnet, and where that magnetism may move to should we make it disappear. Also, wrench housing a fire demon? didn't that turn up last week? or is my time a bit hazy? it has been a few....I don't even remember how long