So sorry to hear about this situation, Worriedgranny! I hope some of the advice others have given about where DS (dear son) can turn for help is useful. Unfortunately, a lot of the arguing back and forth about what he can/should contribute financially and how visits will be handled is common after a breakup when there is a child involved. I hope he doesn't just automatically believe everything his XGF says, but I hope he doesn't write off everything she wants as "unreasonable" either. In short, I hope he lets the court decide. I imagine it will have to be a court in England since that's where the baby will live, but IDK for sure.
One thing I agree w/ is that it is easier for him to travel to see baby than for XGF to bring baby to him. But whether or not she "has to be there' will be decided by the courts, no doubt. Maybe she's just being overprotective, or maybe she has some reason she doesn't trust him w/ a baby (even if it's just lack of experience). Or maybe she thinks she'll use the baby to get him back. But, in the end, it probably won't be all her decision. As long as he's willing to step up and seek legal help.
Hoping all works out in the best interests of the baby!