Blimey, everyone's beaten me to it again!
Right, just looked up what my hospital suggests. Some of this might be obvious and/or repeated so apologies.
Own supply of sanitory towels, nappies, cotton wool.
T-Shirt or nightie for labour
sippers
dressing gown
nightie/pjs for after
breastfeeding bras
breast pads
bath and hand towels (old ones are best)
toiletries (I bought a second set to have ready in my bag rather than rely on myself remembering to go to the bathroom and pack stuff whilst in labour!)
disposable pants
plastic bags for taking laundry home (? didn't bother with this I think)
change for telephone/list of telephone numbers
pen/birth announcement cards
From what I remember I packed a bag for labour and a bag for the stay afterwards. My labour bag had things like glucose tablets and bottled water in and a nice labour kit that someone had given me from Little Green Earthlets. I also put in a newborn babygrow/vest and a 0-3 month one so that baby had something that fitted dependant on size!
For going home I got a maternity outfit ready and put it on a hanger on the front of our wardrobe - nice and obvious for dh . I packed hat/babygrow/cardi and shawl (though not sure why you need this in the summer) in my main bag beforehand so dh didn't have to dither over that one. Put the car seat somewhere easy to spot (middle of the nursery so dh/p trips over it is good) so that they don't forget that too otherwise the hospital won't let you take the baby home.
Pampers care mats are also handy to both change baby on in hospital and also to have at home for when you are in bed.
Pamina, are the arnica tablets any good? I have never used them but my Earthlets labour kit had some lovely bath salts in them which were excellent at helping to heal last time and I'll do anything to speed that process up again!