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The timings of his raised mobile phone would have made it a coincidence if he weren't taking photos of either red light jumpers or women, or both. My brief empirical investigation was nowhere near large enough to suggest concrete results. Whilst I waited at the lights a number of cyclists jumped them, the majority were female.
His choice of location, equipment and actions didn't suggest amateur photographer taking snaps of London to me, but that's my assumptions and biases.
He did take a photo of me as I approached him so maybe I should wait for that to show up somewhere.
You didn't find out which he was focussing on? Obviously both would make him a wanker, just one more literally than the other.
I was going to ask if you were sure he wasn't just taking snaps of street scenes, I see nothing wrong with a bit of photography for photography's sake and there is a limit to the amount of privacy one can expect when out in public, but the transcript of your conversation makes it clear his motives were dubious.