'BTC' was the designation of Allied convoys (together with a numerical suffix) plying the route from Milford Haven and the Bristol Channel to the Thames, and as such reciprocals of the 'TBC' series (December 1944/ May 1945).

The first of these 165 convoys was BTC.1 of 8/11 December 1941 with the 5,114-ton US Alcoa Master, 6,192-ton British Elona, 3,114-ton British Empire Bard and 1,630-ton Norwegian Solhavn escorted by the Canadian corvette Kitchener. The last was BTC.167 of 23/26 May 1945 with the 4,050-ton British Empire Torridge escorted by the British corvette Godetia and French corvette Commandant d’Estienne d’Orves.