Strange Things on a tree

I recently attended a picnic in a London square, the sort with a small park in the middle, and photoed this strange tree with its extra bits. Left to right: lots of context, some context, and just the Things:

I image-googled the London square where I photoed these photos, mentioning the strange Things on the tree, and got nothing. I’m guessing the inhabitants of the square, who include my hosts, would probably like to keep it that way. So, no name of the square. Just the fun of seeing the Things, and a question: What are they? Any suggestions?

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