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CAP 413
The Civil Aviation Publication (CAP) 413 is a freely available Radiotelephony Telephony Manual written and updated by the UK Civil Aviation Authority (CAA).

The aim of the publication is, "To provide pilots, Air Traffic Services personnel and aerodrome drivers with a compendium of clear, concise, standard phraseology and associated guidance for radiotelephony communication in United Kingdom airspace."

All users of radiotelephony, with regards to Aviation, are expected to comply with the phraseology described in the manual.