Thank you all so much for replying and for your suggestions. We have almost 1.5M miles so I think that should be enough for 2 x adults and 1 x infant (actually he will be 18 months by then) who we are thinking of taking on an infant ticket.
I like the sound of the Virgin business class as it is more direct. Do you have any airline recommendations or other re taking our 18 month old? Is taking him on our lap ridiculous?
thanks again.