Just a small note to bare in mind, on this whole subject...

That, although crew will do all to assist in getting any forms of push chair onboard the aircraft, the actual policy is for it to be tagged and checked in to the hold. So, if for whatever reasons on the day, they are not able to take it onboard, it will be placed in the hold, and it will be following the correct policy that will be no ones particular fault.

Expectations are that we will take things onboard the aircraft, and on occasions this can not happen, so please do bare that in mind.
Yes, I know I am short haul, and our aircraft have far less additional storage space than a 747, however things could affect the available additional storage space on any given day on any route.