I wouldn't go for pramsuits - Ithink you are better off with layers- perhaps some velours for chilly days in the summer.
LOts of vests- especially for the exploding poo at the start!
I use baby bundlers or [[http://www.ethicalbabe.com/shopp897549937 ]]nightgowns instead of sleepsuits, you can get them reasonably priced in mothercare and John Lewis- they last for around six months and make nappy changing very easy. Don't take blankets as they may get lost in the hospitl laundry.DH can bring the things you want for taking baby home at the time- or keep it in a separate bag until then. I lost a lovely shawl with DS that my mum had made.
Cardigan, hat, bootie socks
some harringtons (muslins), hopeffully you won't be in for long, but DH can do laundry for you.
In addition to all the stuff for baby, dont forget (i) some babysoap for baby's bath -in case you end up staying for a few days (try and get some organic stuff - otherwise the midwives will wash your baby in whatever they have to hand), (ii) some lanisoh cream for you (if you're hoping to breastfeed) - absolute life saver!
I know the MW's may recommend no products at all, but when was stuck in hospital for 4 days after birth of DS, the midwive washing him insisted on using some awful chemical filled cr*p on my DS to get the birth gunk and dried blood off him - while all my lovely organic stuff, for use after wk 6, was in my bathroom cupboard at home.