Nappy/Diaper stock up

Laura • 28 and husband 30, ttc baby #1 from Dec 2015, West Yorkshire, England ✨ Due 24 Oct 16✨
Hi, Looking to stock up on nappys when on offer before our beautiful little minion arrives in October to help save on costs. For those of you ladies already blessed with bundles of joy how many would you say i would need of each size? 
Thank you