CAP 413: Radiotelephony Manual (link)
This is the twenty-first edition of the UK Radiotelephony Manual (CAP 413), which aims 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.
In addition to editorial changes and minor corrections, this edition includes the following revisions:
| Section | Subject |
| Glossary | Definition for Radiotelephony added |
| Radiotelephony | Introduction re-written |
| Radiotelephony | Information on Police and HEMS Flights added |
| General | Phraseology added for pilot responses to traffic information |
| Radar | Traffic Information and Avoiding Action re-written |
| Area | Aircraft not approved for RVSM operations |
| Appendix 1 | Removal of ICAO Differences: Non-RVSM and PAN PAN MEDICAL |
Source: CAA