Any recommendations for J seats on a 777-300ER? I'm surprised at how full the flights are, but have managed to get aisle seats for all 4 segments (CPT - LGW). I've selected 7B on 2 segments, 7D on the other two - anything in particular I should be aware of, or better seats I should try to get?

I'm not worried about meal choices, etc, as I have a special meal; my biggest consideration is having enough space around me (which I imagine shouldn't be a problem in any J seat).