Thank you for all your help and advice.

I have never actually flown on the lower deck in CW, have always been travelling on 744s and managed to pre-book seats on the upper deck for my wife and I, and have always been given what was pre-booked!

Can anyone provide any thoughts on the 4 middle seats on the lower deck? I had thought these could prove quite a good idea, as it seems from what I can see from the BA website that the 2 seats in the middle of these 4 aren't seperated by much, and could provide more room for my wife and I to sit in with the baby!