Had a nice little visit there this morning
It's a lot smaller than I thought it would have been for some reason, but the pump engines do take up a decent 1/3rd of the ground floor space there, with displays filling the remainder and no public access to the lower areas.
Found out from Kyn that it's still an active pump house occasionally as well, which I would never have guessed, and that in the summer months one of the big pumps/engines is started up (Though its veeeeeeeeeeeeeeeeeeery smelly XD).