Hi guys, I rung british airways to get some advice on these carseats and when I finally got through they were not very helpful. I have just ordered on amazon the the cares harness, asked for it to be fast tracked so i can get it delivered before we go. I don't feel happy with sitting little one on my lap during take off and landing. We have to take the car seat anyway as we re hiring a car the other side. Can we check the car seat in with ba?