There's an entire technique in intelligence based on this, called traffic analysis. It was born during World War II, when Gordon Welchman realized he could use a combination of times, triangulated locations, durations, and the (necessarily unencrypted) call signs of senders and receivers to build an amazingly comprehensive map of Nazi troop movements. The same traffic analysis technique made it possible to guess that certain messages were routine and would have known words like "weather report" in them – which became key to cracking Nazi codes.
And where did all this happen? At Bletchley Park, about an hour north of London, where Welchman designed the pipeline which handled intercepted communications. He and Alan Turing were essentially the fathers of modern signals intelligence. (GCHQ is directly descended from the Bletchley Park operation)
So I'm looking forward to May's further explanations of how the metadata isn't really that important. I'm particularly looking forward to seeing the Home Office's response to the Freedom of Information request for her own metadata, and their explanations for why there's absolutely no reason to release such a thing – even though, by her own declaration, it's perfectly safe.
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