Hmmmm.... a lot of very valid points on this thread.. and it's taken me a while to think of how best to write my response because I do not wish to upset anyone! So I've chosen my words carefully and apologise if I do upset anyone... it's not intended!
I think it's quite clear that there seems to be different boundaries to the 'duty of care' at different hospitals within different countries.
Some extend to ensuring the Mum and baby are healthy before leaving, others extend to ensuring they have adequate safety measures for travel, others want to witness the baby securely fastened into the car... etc
I can understand that depending on those levels of duty of care, that some midwives will refuse to let you leave without a car seat - I'm NOT saying that's the way it should be (as not all cases are the same), but if they're told under no circumstances should a patient leave without baby in a car seat, then theoretically they're liable if something happens on that first journey home.
The correct procedure I feel should be for the patient to sign something that says they are aware if hospital policies but due to 'X' reasons they will be leaving without a car seat, thus taking the responsibility away from the hospital. To me... that would make sense... then those that are travelling by car are not affected as the hospital's duty of care remains the same and those that live near by or are catching the bus can leave with baby in pram or suitable and SAFE method of transport.
I'm only pregnant with our first child... so don't claim to know how it goes... but I've heard that most hospitals get you to sign forms if you need to have a c-section... well if they can make you sign forms for that, surely it's not that difficult to get you to sign a form if you wish to relieve them of their duty of care to you upon your departure... thereby they are legally safe from possible law suits!
Maybe i'll suggest it at my hospital tour tomorrow and see how it goes down????
Personally... we have a car and are 15 min drive from the hospital and as such have decided to use an ISOFIX base with our rear facing car seat! That is what we feel will work best for us and our current car/travel/financial situation.