Falklands/JIC: GCHQ London signal to GCHQ Cheltenham (1730Z) ("From Director for circulation") [tells of "immensely high regard" for SIGINT in present crisis; War Cabinet 24 Apr from PM down spoke "in glowing terms"; CDS "what SIGINT is producing is 500 percent marvellous" (sic); DGI said SIGINT "virtually the only hard operational intelligence we have"; Tovey's pride at GCHQ's achievement] [declassified May 2023]