I wouldn't get loads of newborn nappies as you just have no idea how big your LO will be!!
I got a heap of Huggies size 1 when I was expecting & Maya was so diddy that I found premmie nappies were best for her!!
I think instead of buying aload of nappies, buy 2 packs of newborn & then every week put money on to a Boots gift card & then when your LO arrives you'll have the money to buy aload of packs of nappies in the right sizes