Ha Ha - still won't work despite doing it properly
So on the return journey on our Lufthansa trip I tried to check in online for the FRA- MAN portion of the trip (the first section we had already chosen our seats).
I was unable to check the children in. The website refused to let me do it as they had to be accompanied by an adult. BUT they were accompanied by an adult - my and my wife - DOH!
So, so much for trying to do it properly. I blame Lufthansa's purchase of BMI.
Anyway we got to check in at the point of departure and the cleark acknowledged that we had duff seats but was unable to do anything about it. He was quite apologetic. At Frankfurt another clerk was able to give us the whole back row to ourselves - well done him.
But a poor show from Lufthansa.