I've just found an old list (I didn't write this!) from when I had DD, good starting point for baby stuff, not all necessary obviously but a good place to start and edit. Hope it is useful for someone.
For out and about:
Pram
Rain cover for pram
Car seat
Changing bag
Foot muff for pram
Blanket for pram
Insect cover for pram
Feeding:
3 bottles
Ready to use formula
Steriliser
Muslin cloths
Breast pads
Breast pump
Nipple cream
Bottle brush
Highchair
Nursing pillow
Sleeping
Moses basket/crib
Moses basket stand
Sheets for Moses basket
Blanket for Moses basket
Cot bed
Mattress for cotbed
Cot bed fitted sheet
Cot bed blanket
Waterproof sheets
Room
Room thermometer
Cot quilt
Lampshade
Baby monitor
Baby chair/bouncer
Changing mat
Drawers
Wardrobe
Bathing
Bath
Top/tail bowl
Baby sponge
Water thermometer
Baby shampoo
Baby soap
Baby hairbrush
Baby towel
Baby nail clippers
Baby oil
Healthy and clean baby
Digital thermometer
Baby wipes
Cotton wool
Dummy
Clothes
Bibs
Scratch mitts
Sleeveless vests
Sleepsuits
Your hospital bag
Front opening nighty
Dressing gown
Breast pads
Nursing bras
Slippers
Old/disposable knickers
A towel
Maternity pads
Cash for food and phone calls
Magazines
Cash for parking
Baby books
Healthy snacks and drinks
Comfy, baggy clothes for going home in
Big knickers for going home in!
Maternity notes
Phone
Phone charger
Camera
Camera charger
Memory card
Wipes and face spray
Lip salve
Socks
Water
MP3 Player and headphones
Hairbobble/hairband
Witch hazel/arnica
Baby Bag
4 sleeveless vests
4 sleepsuits
Pram suit (winter!)
Newborn nappies
Cotton wool
Baby wipes
Blanket
Hooded baby towel
Scratch mitts
Going home outfit
Hat and socks
Bottle
Car seat