WSS. 7-10 a day for the first 6 weeks ish; then down to 6-7 a day on average.
Also, don't discount using own brands like I did at first. I stuck with Pampers for my eldest, and only tried out Asda, Tesco etc when my 2nd was born as I had two in nappies. I found the supermarkets own just as good as Pampers - I wished I tried them earlier as I'd have saved a fortune! For example, Asda's own nappies are ofetn on offer 3 packs for £10 which is a huuuuuge saving compared to Pampers/Huggies etc, even with coupons!
Noah Gabriel 11.06.05 
Elijah Cameron 28.04.06
Sebastian James 15.05.08
Nathaniel Joseph 04.06.10