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It was a hunch mostly, but a strong enough one to warrant the long ride there. The prospect of Woolwich Ferry thrills may have helped too! I only knew for sure once I got there and compared your pic to the leaves in the background. I had watched the DVD a few months ago, there was something about the undulating narrow strip of land that looked familiar. You mentioned Canary Wharf too which in relation to the previous tag meant this was in the right direction. I'd like to go back again and trace some of the other locations.
Old: Maryon Park, Charlton. Film location of Blow Up, 1966
ie:
New: Assemble before blowing up