CAP 670: Air Traffic Services Safety Requirements (link)
This publication issued by the Civil Aviation Authority (CAA) sets out the safety regulatory framework and requirements associated with the provision of air traffic services. This Third Edition has now been updated by amending document 01/2014.
This amendment makes numerous amendments including revisions to the section regarding change notification requirements in Part A ‘The Regulatory Framework’, as well as numerous textual changes throughout the publication.
Source: CAA