Well, after reading about the law changing in September (and baby due in October) I asked my MW and she said there's no problems holding the baby in the back set of the cab!!
We don't have a car, and we almost never get in cars or taxis, being usually on cycles or public transport. In fact the only people we know with a car, who might want to give us a lift ever, are my grandparents, at the other end of the country. I would fear for all our lives getting into a car with my nearly-blind grandad - even without a child I avoid this preferring to walk from train station to theirs when I visit. Oh and my mum lives in a camper-van, which only has a pair of front seats anyway :-/ I've never travelled in that vehicle with her and her partner.
I'm quite happy to hold the baby and would actually feel more secure like this, than have them wobbling around in a baby-carrier... But if the hospital refuse to let us leave without a carseat, surely I can leave in a cab and DH can walk home with our baby (we are 20 mins walk from hospital)???
There's a slim chance a casual friend with car & babyseat will give us a lift, but TBH I'd rather leave hospital with just DH and baby. The friend who's offered doesn't actually drive herself, she's just going to tell her DP to, and he's not the most reliable person on earth, nor that great a driver LOL
Yet blind grandad or boy racer are both seen as a 'safer' options than me holding baby in a cab?
Sorry for the waffle, but this is something that's caused me a certain amount of confusion and a variety of feelings ranging from stress to flippancy.