Well, there is now another London pyramid out.
I'm toying with the idea that the new riddle on the old pyramid may in fact be in a new location, whereas the new pyramid may in fact be a new password in the old location -
hope that makes sense!!
I can get the old location of pyramid 7 to fit (to a certain degree) with the riddle of pyramid 18.
The new riddle on pyramid 7 seems to fit better with another location I have in mind.
I don't suppose anybody's been to see that other pyramid in London to see whether it's now actually a prize pyramid?