Cross post niff! Very sweet that you remembered and thanks for the luck.
Baby "essentials" list, mostly from carrot:
Transport
Car seat
Car seat base if needed
Pram
Sling (optional)
Sleeping
Cot/crib/moses basket/co-sleeper
Matress for the above
Fitted sheets (at least 2)
Blankets (3-4)
Baby sleeping bags if you plan to use them x2
Clothes
Sizing goes either
Newborn (7.5lbs) - Up to 1 Month (10lbs) - 0-3 Months
Or Tiny Baby (7.5lbs) - Newborn (10lbs) - 0-3 Months
Weight is your guide. Only because it says 7.5lbs doesn't mean they won't fit if you baby is slightly heavier - I found my DS still fitted into most clothes even if he exceeded weight limit.
If you know you are having a big baby you can skip the smallest size, but if unsure I would still get it. Maybe don't take it out of the packets in case it's too small.
I'd say you need:
Short sleeved bodysuits (AKA T-shirts with poppers) - 7-10 in each size
Don't buy long sleeved ones, it's hard to put 2 long sleeved layers without one sleeve riding up. They can be useful when you start putting baby in dungarees or sleeveless dresses, but you can always invest in those later if you see the need.
Babygros (onesies) - 7-10 in each size
A couple thin hats
One or two thick outdoor hats
A few cardigans
Socks - yes babygros have them but sometimes if it's chilly you might want to put a bit extra on their feet.
Something for outside - i.e. snowsuit
Don't buy any cute outfits. You'll be given loads.
Feeding
I'm sorry I don't know much about FF. I guess you'd need formula, bottles+teats and a steriliser.
If BF
BF bras
Bf pillow
LANSINOH
Breast pads
Plastic backed bibs
Muslins (we had about 20, which was about enough, but DS was a very sicky baby. You might want to start with 10 and get more later if needed)
You might get a couple of bottles jic.
I would say don't buy a pump until later on if you decide you want to express. For me expressing was a faff tbh.
Some people buy ready made cartons of formula if there are issues with bfing - I didn't though.
Changing
Changing mat (we also put kitchen roll on it so that it's not too cold for baby to lie on and also clean up excess poo)
Nappies - a couple packs of size 1 and 2
Cotton wool and cotton pads - pads are much better for cleaning their bum
Baby wipes if you plan to use them
Nappy barrier (i.e. Sudocream)
Nappy rash cream (i.e. Bepanthen or Metanium)
Playing
Bouncer
Play mat with dangling toys
Don't buy any toys, you'll probably be given loads. Newborns are not really interested in toys to begin with. If you really want to, you can buy black and white book with lines and faces - they like to look at those.
Bathing
Baby bath and/or bath support. You can wash your baby in a sink, but unless you have a huge sink they will grow out of it pretty quickly
Hooded towels - not essential but v useful. Ikea do really good ones.
Sponge (optional)
If you want to use some kind of baby wash/bubble bath, get a soap free one. Def not J&J. We use Oilatum but it's quite expensive.
Misc
Ear thermometer (optional)
Baby scissors
Brush
Dummies if you plan to use them (I would get a couple even if not, you never know, they might save your sanity)
Calpol
Infacol
FOR ME
Foods that can be eaten one handed including fruits