We're back! I went to the other thread about travelling with kids, and found some great ideas... my biggest worry was about getting Elena to sleep on the plane, because she's used to sleeping in her own space and being able to stretch out. But because we had her in our bed for two weeks, by the time we got to the night flight she coped a little better in my lap than I thought she would.
For a little baby who'd never travelled further than the seaside before, she did really well - we did 2700 miles in the car over two weeks (mostly while she slept!)
I do think there's some sort of threshold though around seven/eight months where kids get squirmier and more curious. The journey would have been very different a month ago. What's good though is BA gave us a baby seatbelt that kept her attached to me, so I could be handsfree without worrying about her falling. She was able to stretch and pull as much as she wanted, so in a way it was better than being at home on the sofa.
About accepting offers of help - I definitely agree with that, and would go as far as to ask for help if I had to. Despite all my dozens of international travels I managed to make a couple of mistakes in navigating the airport (including going to the wrong terminal, though that was the travel agent's fault), and it added hours and stress to our journey, which finally ended with the three of us and our suitcases bailing out of the hotel/airport shuttle at the wrong hotel and walking the rest of the way... It pays to make sure your hotel shuttle goes to your terminal. Though I should have known this!