Air Traffic Control - Feb55.   This picture is the approach controller's desk.   This is where the controller mainly assisted pilots returning to base by doing QGHs ('Q' code for controlled descent through cloud).   For this the bearing of the aircraft was determined by a radio direction finder that we called the 'homer' (and later CRDF).   This was passed by the DF operator on a loud-speaker intercom.   From this information the controller told the pilot the bearing to steer.   The controller also had three other frequencies on a press-button selector.   These were local airfield, general group - a frequency that was used by visiting aircraft plus 111.42 MHz which I think was the 2-Group fixer frequency. (Thanks to Dick Endecott)