Base-linked oilers confront a three-front war

Britain planned to stock large fuel reserves at bases and send slow oilers out to refuel passing warships before returning to port. The oiler did not have to accompany a fast formation, so older and cheaper vessels remained useful within the prepared base network. The wider plan assumed France would press Italy from the western Mediterranean while Britain attacked from the east, with a possible carrier strike on Taranto. This left the main Royal Navy effort free to move toward Japan once home waters were secure. German rearmament changed the calculation because the Home Fleet first had to protect Britain and the Atlantic approaches. Britain was replacing older auxiliaries in a generational programme expected to mature around mid- to late 1941, perhaps early 1942. The programme made sense under its original assumptions but remained incomplete when Germany, Italy, and Japan became simultaneous threats.