I trust you are talking about the BA54? given your recent posts being from South Africa.
18F is a nice seat, but on a fullish flight a strong chance 18E would be occupied. 64K is a fine seat for that long overnighter.
How was your trip? I am feeling left out as lots of friends and colleagues seem to be holidaying in South Africa at the moment, and I'm not going to get another chance until early 2015