(c) The responsibility for the provision of intelligence to Force Commanders (both before and after the Force has sailed) will continue until such time as the assault is made. Similarly, I.S.(0) will be responsible for keeping intelligence summaries up-to-date for all operations which have been planned and which are held in readiness in the United Kingdom. (d) I.S.(0) will be responsible for indicating to I.S.T.D. (through Commander Slade .. see J.I.C.(41) 418) what topographical information is wanted for the operation and how many copies of I.S.T.D.'s report will be required.