The Rules
Many of you are quoting the CAA avoidance of fatigue document as if it were a set of rules, this is factually incorrect
In order to obtain an air operators certificate, licence to operate, each ailine submits to the CAA a set of manuals containing the rules it intends to use in governing flight activities these rules may of may not be the same as those in the CAA documnt
The CAA then grants airlines an operators certificate against the proposed rules
Essentially the CAA document is irrelevant to crews because it does not govern their activities unless their company happens to use it exactly as published, none do
To discover what actually happens in airlines you need to examine the manual of the airline concerned
Hold tight