Register for photobox and get 40 prints free, thanks to my friend Thea for the recommendation.
6"x 4,5" pictures (matt or gloss/with or without borders)
Photobox have a pretty good reputation
from Quidco "Get 20% off your order over £20 + £7 cashback for new users or 20% cashback for repeat users. Give a personalised photo gift this Christmas!"
Postage and packaging is not included in the offer and costs a minimum of £1.49 per order for First Class Royal Mail delivery in the UK (thanks expressman33)