Offer is back @ Snapfish UK (operated by HP)
Was originally intended to be for amazon customers only but all it requires is a coupon code ("AMAZON") at checkout, no amazon purchase necessary.
Get 40 Free 6x4" Photo's and 20% of all gifts when you create a free account. Just enter coupon code "AMAZON" at the checkout. All you pay is delivery which is £0.99.
Although it says new customers only, it is after all just a coupon code so it may be worth trying if your an existing customer but I doubt they would allow...
New customer registration must be done though the specific link related to this deal or it won't work. Also, even existing customers can always just create another new
Specific Link - (http://promo.snapfish.co.uk/amazon/amazon2010)
£5 Quidco too. (Thanks Hosbols)
Deal valid till 31st October 2010