I had 64K on a LHR-SIN leg and I loved every minute of it. Very private and lots of space. On the way back from SYD via BKK I had 64A and didn't like it as much as the light from the galley was noticeable as well as the fact that the First Officer came back for a chat with the cabin crew and you hear the odd sentence when they raised their voices. If I were you I would try and bag 64K. I paid for it as have no BA status but it was worth every penny.