I also believe that in the Ethiopian incident they found passengers still strapped in their seats, with scratch marks on their side indicating that they were frantically trying to unbuckle their seatbelts as if they were in a car.
I flew for a charter airline where it was compulsory for passengers to pay attention. We were instructed to approach passengers reading or talking and ask them to hold back for a few minutes.
Charter aircraft are very different from scheduled aircraft, except for EZY/FR. The high density requires a different approach to SEP. By nature, SEP training and implementation is much stricter on UK charter airlines. For example, there are many more restricted seats - all aisle seats in the first two rows and the last two rows for example.
The chances of a passenger to be travelling week in, week out on a Monarch flight are slim, not impossible but slim. The passenger profile on ALC is going to be very different to, say the Friday night FRA on BA.