Bletchley
Based in 'D' Block, Bletchley Park, the STE trained technicians to maintain airport and en-route telecommunications and navigational aids for UK airport and en-route services, including telecommunications, navigational aids and radar.
A two-to-three-year locally-domiciled apprenticeship trained technicians who were then posted to airports or en-route centres for on-going employment. STE also provided training facilities for existing technicians to keep up to date with technological developments or to enhance their skills on a broader range of equipments.
Apprentices had exclusive use of the 'AT Club' (an imaginative contraction of the 'Apprentice Technicians Club') and also to the Bletchley Park 'Radio Shack' with a call-sign of 'G4BWD' - 'Golf Four Building Works Department', able to access the 2metre-band.
In 1974, STE developed a newer training course, reducing training to a one-to-two year period for higher-qualified ('A'-level and beyond) entrants, nicknamed 'Super-Techs'.
Read more about this topic: Civil Aviation Authority (United Kingdom), CAA Signals Training Establishment (STE)