Do you prefer hot or cold drinks? Either way a good big flask is a good idea and/or a big jug for squash that has one of those cylinders you can freeze that then sits inside the jug to keep your drink cool.
Just before baby due get in/prep meals and snacks that are quick, easy & appetising and nutritious.
I would say halve the newborn clothes list and get 0-3 months and 3-6 months stuff too.
My dd was skinny but LONG and the newborn stuff never fitted her properly. Especially ones with built in feet and they grow FAST at this point too.
“Long phone charger cable for hospital when the plug is miles away.” yes!
I’d suggest considering something like this too:
https://www.amazon.co.uk/gp/aw/d/B07QMVB2WK?psc=1&ref=ppxpoppmobbbasintitlee__
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_Recommended to me by another miner. Then you can charge phone and tablet at same time if you wish.
“Are a baby sleeping bag and baby bath essential items would you say? “ no. Many never use baths I had one and used it once! It was a pita! Much easier to bath dd in bathroom sink (it was a big one we had then) or even a (new) washing up bowl (what my parents and grandparents did) at first and then in the big bath with one of us in with her and then we got her a bath seat similar to this:
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https://www.amazon.co.uk/Safety-1st-Swivel-Bath-Seat/dp/B0187EEZP6/ref=mpp_saa13?keywords=baby+bath+seat&qid=1582659255&sr=8-33_
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_Which she loved!
“In terms of bottles and steriliser - I thought I would wait to see how EBF works out before buying those?” We had a steriliser as I hoped to be able to express once established plus you use them for other things too (dummies, some hard to clean small toys, medicine spoons, syringes etc) but I couldn’t express.
I understand your thinking and I was the same, it weirdly didn’t occur to me I might have trouble bf, but some do, so you may like to have a couple bottles etc in just in case.
“somewhere for baby to sleep during day?” We used the carrycot that came with the travel system. Or the bouncy chair, which worked a treat if I plonked her in it in front of a spinning washing machine!
Nightdresses for hospital - ones with button through tops for feeding. You won’t necessarily want pyjamas on with a waistband irritating your tummy especially if you end up having a section. Also a buttoning dressing gown might be nice to have.
Given when you’re likely giving birth - a fan! Maybe even 2! Possibly bug nets too depending where you are in Uk - here in Scotland summer = midges so essential here.
A laundry net - for washing tiny socks and mitts so they don’t get lost/bugger your washing machine!
If you don’t already have one, one of these:
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https://www.amazon.co.uk/JVL-Multi-Colour-Round-Sock-Dryer/dp/B008VC35QU/ref=mpp_saa115?keywords=laundry+peg+for+small+items&qid=1582659844&sr=8-15
Amazon link but most pound shops, b&m and similar have them for £1 maybe even get a few, very handy.
Again if using a tumble dryer keep in the laundry net or your dryer can end up buggered!