I recently heard something about oak trees and acorns that sounds plausible. Most years the amount of acorns produced by trees are almost completely consumed by woodland creatures. In order for oak trees to reproduce, every seven years (not sure of the interval) the trees produce many more acorns than usual satiating the creatures that feed on them and allowing the bountiful surplus to produce new trees. This is certainly one of those years at least around my area. Tons of acorns have dropped.
It is so funny that you mention picking up an acorn in London. I have several conkers (buckeyes in the states) from London that I have been carrying around in my pockets for years. I am happy that someone else does these sorts of silly little things.
I found your page via a link a friend posted about your suitcase project. This photo of your lab reminded me of the lab we had when I was a kid. Every so often, Bubby would get loose and we’d find him over at a nearby apartment complex, swimming with the ducks in the pond there. Good memories. 🙂