C.C.S. 166/1/D ya kasance wani bita da kuma fadada na "C.C.S. 166" da aka gabatar don tattaunawa ga Joint Chiefs of Staff a ranar 20 ga watan Janairu ta Birtaniya Chiefs of Staff. Tattaunawar ta kawo batutuwa da dama, kamar yadda za a rubuta takardar don daidaita damuwa da masu ruwa da tsaki daban-daban game da fifikon da za a ba wa ayyukan anti-U-boat sabanin goyon baya ga
ayyukan da aka shirya za a yi a filin wasan na Bahar Rum. An gabatar da sauye-sauye guda biyu kuma an amince da cewa a saka "saboda dalilai na siyasa" a cikin "... wanda Gwamnatin Mai Martaba ta bayar daga lokaci zuwa lokaci [saboda dalilai na siyasa] "... kuma an cire kalmar "sintetik" "shuke-shuke mai na roba". An yi ƙarin canje-canje ga daftarin na Memorandum na Burtaniya a cikin tsari na wasu jimlolin.