Fanmail.biz

So I have just found these informations about prices for sending the letters from UK:
http://www.royalmail.com/portal/rm/cont ... tId=400036
however, I need to know what is 8x10 envelope:

Letter

or

Small packets and printed papers?

Thanks for any help.

BUMP

It would be classed as a large letter, if you're just getting a photo back. It all depends on the weight though, as it says on the website.