A friend Ken informed me that his wife Angie recently met up with a guy who apparently built Concrete Barges at Victoria Docks in London! He believes the actual Barges were used as part of the floating bridges, three seen below.
Aerial Shot of Mulberry Harbour D-Day June 1944
There follows some photos of these Floating Bridges with what looks like Concrete Barges...
Now that looks like an FCB!
I have examined the following 'Blue Prints' of the Roadway and 'Floats' as they are called, for any evidence of FCB's.
Rare Diagram of D-Day Floating Bridge
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