The Arnold Hague Database the BB convoy series. The BB series of convoy ran from Belfast Lough to Milford Haven, with the exception of BB.19 and BB.106H that sailed from Holyhead, and ran from March 1941 to May 1945. The series not only catered for local traffic but also for vessels arriving in Belfast from the Atlantic convoys. The series is almost unique in that convoy numbers were re-used and are differentiated in this database by refering to the second series as 'Series 2'.
Note that BB.63 and BB.2 (Series 2) were cancelled.