The launch of the Clapton logboat reconstruction – on the River Lea at Clapton in 1988.
The photo shows Damian Goodburn and Dana Goodburn Brown – who is hanging on for dear life in the front..
You can link here to a good article about the reconstruction that appeared in:
London Archaeologist - Volume 06:01 (1988) via ADS (19MB)
Or view a much reduced PDF here (1.1MB)