That's what I get for just doing a quick Wiki walk -- Maughan Library -> Strand Campus -> OK, that's where it is? Sure!
"LB" means London Borough, I take it?
A little more digging (No further programming yet, just some spreadsheetery) reveals:This node is 13 steps away from the master node that represents the whole world.
It is the only node of this size.
How many points/unique locations it or its four children contain is still an open question.
How about nodes 12 steps away from the master node?There are 20 of those, with the majority in the UK. Three are in Puerto Rico. One at the Cincinnati OH / Covington KY line. Seems natural, with dense road networks in these places. And there's one in...
Portland, meaning I was probably a bit too generous with waypoints when designing US1Alt, ME77 & pals back in the day.
How about:The least dense node with 1 or more waypoints?