Aha! Much obliged; definitely my recollection from rather a long time ago!From the "Mulberry Harbour by Geoffrey Futter" series in Airfix Magazine.
Vol. 23 No. 6; February 1982; Part 7:
"Mulberry Harbour comprised three main elements; these being breakwaters, pierheads and floating roadways which connected the pierheads to the shore. The breakwaters, which consisted of the 'Bombardon' floating breakwaters situated outside the harbour limits to shelter deep water shipping, the 'Gooseberry' blockship breakwaters and the 'Phoenix' reinforced concrete caisson permanent harbour breakwaters...
...The pierheads, and the floating roadways together with a number of associated devices and equipment, were collectively code-named 'Whale'."