A plastic measuring jug. Put warm water in it and pour it onto your bits during and after having a wee, as it helps to reduce the stinging a little bit, and to keep any stitches hygienic.
A hair clip or hair elastic to keep the hair out of your face.
Make up wipes/baby wipes. I always wear make up, including in labour and it ran down my face with the sweat.
A machine washable, or cheap pair of slippers. I was terrified of MRSA and other hospital superbugs, so I recommend doing one of the above. If they're cheap but not machine washable, throw them away when you leave hospital.
Lots of comfortable cotton knickers, preferably in black so any leaked blood will not show up.
Lansinoh nipple cream - a Godsend!
Lots of snacks, treats and drinks for you and your birthing partner.
A cotton nightdress in a dark colour for giving birth in, and one more of the same for sleeping in.
A thin, lightweight dressing gown in a dark colour.
Yours and your birthing partner's phone chargers.
Camera, unless you'll use your phone.
Plenty of change for the car park.
Magazines and an IPad or laptop or similar for watching tv or films if your baby takes ages!