Firstly, the FSO states that the CAPTAIN may authorise the use of the assist jumpseat for AIRCREW and their travel beneficiaries i.e. Tech and Cabin. It does NOT state that it is tech crew only.
Secondly, the FSO does not mention anywhere that this is for takeoff and landing only. One would assume that after takeoff the crew rest seats could be used but this may not be an option. If not, then it's the jumpseat the entire way.
Thirdly, this applies to 380,744,330,767
BA use this same policy regarding jumpseats. A friend of mine did LHR to BKK in a 744 cabin crew jumpseat late last year.
READ THE FSO BEFORE POSTING ON PPRUNE!!!!
Tech crew families have access to 1st class and business class and economy and Cabin Crew families have access to business class and economy class.
I do not think that operational seats should ever be used by passengers. As for only being used for landing and take off....thats tosh
Captains get First Class upgrades, everyone else its business only
And finally, when it's really tight and you have to get home are you not going to ask for the flight deck jumseat then????