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Hi,
Sorry to say i found the data 2 years ago and laying my hands on the source now is not going to be easy.
The riverside development https://barkingriverside.london/
As you can see the site is feet from the Thames, within short distance from the Thames barrier and has no raise thresholds at the door step.
The site is partly occupied by Barking Reach Power Station so i would expect a history of accurate data collection.
I found the data in a collection of Thames barrier events, environment agency forecast flooding likelyhood maps.