Originally Posted by
mmxbreaks
Solo traveller on 777 LAS-LGW. Mainly a sleeping flight. Surprised the blocked seat next to me hasn't remained blocked.
Would like to at least attempt to get an empty next to me.
I assume you are also looking at Expertflyer, since you cannot tell blocks via BA.com. I would definitely go for 5A now, see my post and photo above (though that's 5K). If when you board - and assuming the flight remains half full, I'd consider sweeping over to 5E and 5F if you are allowed to take both.
If the empty seat is that important for you then you better go further back into the second cabin, the first cabin is more likely to fill up. However to and from LAS, BA generally fills CW quite easily.