Impressive,
It is not so unusual for a pilot not to clearly understand FTL's and you yourself have just proved this point.
The FDP does not end when one goes off duty at base or when one reaches the hotel if away from base.
The FDP ends when one is 'on blocks' on one's final sector thus any discretion would end at that point. Thereafter, and under normal circumstances, there is a nominal period of perhaps 30 minutes between end of FDP and off duty.
If away from base and travelling to a hotel then this is covered under FTL's 'travelling time'. Under normal circumstances what time one may reach a hotel bears no reflection on the FDP, DP or discretion.
If your 'links' to the CAA say otherwise then they are talking from their butt!
This has already been covered with the Emerald Guys and previously established, before your recent posts, that Emerald are not producing illegal rosters but it is untrained Operations staff changing rosters without checking or indeed understanding the FTL's.
Say Again claims this to be illegal rostering and I guess from his personal point of view, that he finds he has been rostered illegally, he feels justified to say this but, Emerald are not producing illegal rosters, they are however not training their staff correctly if at all!