Congrats on the first pink bump remembering! My scan is tomorrow at 11.20, hoping that baby is feeling co-operative.
Mat leave - I am having the full year off 28th July 2013 - 26th July 2014. I am very lucky that I work three short days per week (8.30 - 3.30) and can afford to have the whole year off. It's my last mat leave, so I intend to enjoy it (fingers crossed!)
Woofers LOL at tummy time for us! My little ones both hated tummy time with a passion. However, I did pick them up all the time naturally, holding them upright, feeding etc so we never had a problem with a flat head. My friend's DS had to wear a brace thing because he had a flat head, but it was a medical thing not because she left him lying down. We never had a sheepskin rug, I always thought they would be a nightmare to clean if they puked on them! Also, remember that the books are only there to advise you - your baby is an individual just like you, and you'll work out what to do. The absolute best source of advice I had was my DMum who was an absolute star - don't know if that's an option for you, but if you have any close female relatives they will be a godsend.
Co-sleeping - i kept DS and DD in a crib in our room until they stopped feeding through the night. We co-slept a little bit, and it was fine for us and they both now sleep through the night like angels. You've just got to be sensible and follow the guidelines eg no drinking, no smoking etc.