Also note that under BA’s interpretation of not separating children & adults, you are not guaranteed to be seated next to each other. The child may be immediately in front or behind, or across an aisle.

WT+ is very popular, invariably full and the chances of there being 2 x window pairs left by check-in are minuscule.

Let’s say you end up with 24E, 25E, 26F and 26J. If that’s not acceptable, you’d better pay.