The FO I read was a Captain on holiday who got called into cover some sectors.
Which was the reason why I made the comment that jumping into the RHS when you haven't flown in it for a while can be a bit of a sod.
I also have it in my mind that it could be the reason for the engine selection mistake as number one will normal be next to his leg and from the RHS its the one on the other side.
I have sneaky feeling the 16k guy was an authority flight ops inspector type. More than likely ex fast jet and only ever flown heavy's if the ones in the middle east are anything go by that inspect TP's.
To be fair the Guy in the ME freely admitted he didn't have a clue how these fan jobs worked and took an active interest asking us questions and getting to explain things. In fact it was more of check than we would have had in the UK as I was getting bombarded with prop theory type questions.