A UNIT R/T operator going by the call sign Trap One received communication from Captain Clarke during an attempted Kraal invasion in Dark Peak, Derbyshire.
Captain Clarke, acting as Greyhound Leader while the Brigadier was away in Canada, filled him in on the latest updates from the field. During this transmission, the UNIT operator was under the influence of the Decayed Master, and told Clarke that it "couldn't be much quieter [...] here at [UNIT] HQ". The Master shot him with a staser once transmission was over. (AUDIO: The Oseidon Adventure)