Popped up there at lunchtime for a look.
Sorry about the bad camperphone photo. I have some proper photos, but I don't have the means to download them here.
It's a proper pronze plaque that must have cost a fair bit, and it fills a hole that was left by the abandoned milleniunm clock (the chime in the slime). I say let it stay, at least until someone comes up with something better to fill the hole.
It's hardly the first memorial to a person or event of questionable historical accuracy.