Originally Posted by
G-BOAC
It applies to F only as there is the Buddy Seat in your seat. With J, no visitors applies even more so on the UD for security reasons.
Not always.
I have been in J on the UD with Mrs. Greg66 in F downstairs. I tried to visit here - and was refused entry to the F cabin altogether. Twenty minutes later she appeared upstairs to visit me.
I suspect that there is a degree of elasticity in the application of the rules surrounding this, which depends on the cabin crew on the particular flight.