Formula - DH went to local Co-op and chose one at random (Cow and Gate). Couple of weeks later my cousin told us that Aptamil is the closest to breastmilk.
Right, going to weigh in with my favourite/most useful items for newborn...
The three main things baby will need (IMO) are: feeding, changing, clothes:
Changing
Newborn size 1 nappies
Cotton wool wipes (not balls as mainly got stuck on butt!)
Little dish for luke warm water (just grabbed dish from cupboard)
Feeding
Lanoish cream
Breastpads (I used Boots own brand)
As I had problems with breastfeeding, I expressed for 8 weeks with formula feed top ups. Reduced expressing gradually to stop blocked ducts. I didn't buy the following before baby was born as was planning on breastfeeding and all of the below was available from our local Boots:
Medela breast pump
Medela bottles
Microwave steriliser (absolutely fantastic, cleaned x4 bottles in 8mins).
Thermos - to have boiled water ready for night feeds.
Formula powder dispenser (not used immediately but v useful when out and about during feed times).
Clothes
Body suits x6
Baby grows x6 with integral scratch mitts.
Hat (for leaving hospital)
x2 Blanket (for pram & moses basket)
Cardigans x2
Pram suit (didn't have one of these as DD was born in May but think a good idea for Nov baby!).
I didn't have a sicky baby but would have just bought more baby grows if DD was going through them quickly.
Babies cannot moderate their temperature like adults can, so the norm is for them to have one layer more than you are wearing. I often checked DDs chest to see if she was too hot or cold before putting to bed. Their hands and feet get very cold but that's because their circulation is poor.