Wiz
Apparently CAP 271 is a maritime shipping law document (according to Google).
Seriously, I would think that the CAA were upset about the application of CAP371 limitations as a framework for normal rostering, meaning most duties are rostered to the limit.
Also the fatigue-inducing change from earlies to lates in the middle of a six-day rotation.
Also the practice of rostering flexidays at the end of a continuous six day period, creating a regime of 7-day duties without adequate rest day cover.
Also the fact that max FDP duties are rostered for up to six consecutive days.
If these threats are true, I'm sure the eJ management will have to make an embarrassing climbdown. They will naturally feel hard done by or "got at", and we will be feeling the edge of the knife from their petulant revenge for years to come!