That LOSA letter is too funny.
"A passenger seat will be booked for the observer so that he can get some rest"
Aaaaahahahahahahahah.
I can see the company is rightly concerned about the risk of an observer making a critical error while ticking boxes on his form as he reaches the end of a tiring back of the clock turnaround.
As for the other two poor bastards doing the approach, who gives a toss.
I am continually impressed by this companies blatent disregard for its crews.
Looks like the LOSA observers might have a slightly stronger union than us.
V