If I buy 2 x WT+ seats on tomorrow's (March 30) flight from GIG to LHR (BA248), I can see from the seat map that there are only 2 free seats but they are in the middle in different rows. Like this:

X X ---X X X ---X X
X X--- X 1 X-- -X X
X X ---X 2 X-- -X X
X X --------------X X

So, what happens? My daugher is 9 and would not take kindly to sitting in the middle between two strangers.