OK - here are some extracts from Lowfields:
7th Dec
â—¦As Ursula leaves, she suggests Rob should ask his brother to be a godparent which Rob hastily brushes aside and Helen says she was thinking of Adam and Ian. Rob brushes that away too. Once Ursula leaves Rob is clearly angry at the mention of Adam and Ian. They are immoral and not the sort of influence they want on his son. She should have consulted him first ... well shouldn't she?
30th Dec
â—¦Rob is amazed at how much the baby has grown since the last scan; what are they going to call him? Learning that Helen has not yet been able to contact Ian, he is scathing about his implied enthusiasm to be a godparent.
6th Jan
â—¦Since Ian has not replied to any of her calls, Helen goes to Grey Gables where Ian very reluctantly agrees to a coffee. When Helen asks him to be godfather to the baby, Ian coldly tells her that he wants neither to be her friend nor godfather to her baby. A true friend would have told him about what she saw between Adam and Charlie; Helen told Rob.
So, I think there was some element of mind-games, Rob not wanting Ian to be godfather, but then making Helen suffer for it by constantly asking her why she hasn't asked Ian or why Ian is ignoring her calls. Mind-games - because surely if he were consistent he'd say "I've already said I don't want us to ask Ian to be g/father, so don't contact him."