The FS series of convoy ran from Methil or the Tyne (mainly Nov. 1939 - Aug. 1940) to the Thames (Southend) and ran throughout the war from September 1939 to May 1945. The route was protected by defensive mine fields but was vulnerable to attack by U-boat, E-boat, aircraft and enemy mines.
Note that Hague used his own numbering system for this series. In fact, FS convoys were numbered 1 - 100 in repeating phases. Note also that Hague's records for this series is far from complete.
An additional FS series ran from Scapa Flow to Norway.
TDS = numbers of ships per Trade Division Signal.