Muslins - Aldi ones are the only decent ones I've found so you'd need a baby event to buy some.
If BF - lanisoh nipple cream and breast pads (I found other ones would smell funny).
If FF - mam bottles and perfect prep machine (plus 2 thermos flasks, one with cooled boiled water and one with boiling water to make up bottles in minutes on the go - about 1/4 hot, 3/4 cold water per bottle).
Kindle or Readly app (£5 a month a think but 100snof magazine options) for night time feeds. Also find a MN postnatal group so you will have people to message in the middle of the night who are going through similar things to you.
I wouldn't bother with sleep pods etc as friends have struggled to wean babies out of them. Ewan the dream sheep helped in the first few months though.
Aldi nappies are good for sizes 1-3 (then get a bit leaky).
Water wipes - easier to carry around than cotton wool and water.
Hire a sling from a sling library when LO arrives.
A dummy. I never wanted to use one but it saved my sanity when LO was about to have a crying fit in public.