I've never known a dad go to a booking in appointment or any midwife appointment, it's certainly not the norm in my area.
The booking in is just a fairly long and pretty boring appointment about your medical history and anything significant about your partner or families medical histories. He doesn't need to be there for that....Just ask him before you go if he had any issues as a baby/child or now if you don't know already.
The scans is a disappointment, granted, as that's a lovely thing to share with your OH. I recently had my 20 week one though and went alone and it was absolutely fine. A lot better and more chilled than I thought it would be.
As for the birth, there is still nothing to suggest any of us in the UK will be forced to give birth alone. It's all just rumours and scaremongering.