I have been using this web sites for many times now, what you have to do is register a new member then upload 40 photos, then pay the shipping which is i think £1.49, i say £2 because i wasnt sure if they have increase the postage recently.
Remember upload only 40 photos at only one time, and you get to choose different effect like matt surface or shiny gloss surface with or without boarder. Oh, you cant change the format of the photo, maybe thats the catch. If you upload more than 40 photos, YOU WILL HAVE TO PAY FOR IT!!! so just to make sure you have excatly 40 photos
Then you click check out and double check you have selected the correct finish and boarder etc. then you will only pay for the postage.
After that, just create another accounts, and doesnt matter if it is the same name or address, they wont care, but you need a different email address, that should be easier enough in GMail, Hotmail etc. They arrive at your home in less than 3 working days :)
This offer seems to be on the web sites forever, I have been using this web sites since LAST APRIL, and occassionally they increase to 50 photos instead of 40 photos! There is absoutely no catch, I know some retailer need you to purcahse 40 photos, then the next 20 is free, but I can 10000000% assure this web sites wont do that as I have used loads of time, at least 10 :) enjoy free 1.49 for 40 photos, even cheaper than boots or jessops, so why bother paying when you can get it for less than £2