There is a new consultation on the Joint Emergency Services Interoperability framework (here) which provides access to the draft Second Edition of the Framework (here).
This is a very well written document that is very useful to any organisation, such as a REPPIR or COMAH site, that trains to respond to major incidents with the emergency services.
At 50 pages long you might struggle to get your Command Team to read the whole document but it makes a great basis for a Command and Control training course and as a guide when writing your emergency response manuals.