Originally Posted by
moeve
Now by doing this BA also violated the rules - this can therefore not totally exonerate them now on the return leg. In reality they F***** p as badly as the OP did and should be doing everything to help their passenger since BA illegally brought a passenger to wherever he is now because they missed the expired document on the exit leg.
Not for me to defend BA but this is of course 100% nonsense.
There are no exit controls from UK and OP was admitted to Hungary by local immigration. No rules were broken nor was there anything illegal.