'FBP' was the designation of Allied personnel convoys (together with a numerical and sometimes a literal suffix) of ships returning empty from 'Overlord' from the Seine Bay to Portland (June 1944).
The one known convoy of this series was FBP.1B of 7/8 June with the 7,114-ton US Borinquen, 10,552-ton British Cheshire, 8,331-ton British City of Canterbury, 12,093-ton US General George W. Goethals, 8,358-ton US George S. Simonds and 9,557-ton British Lancashire.