Great (British) Aran Afghan

Hi all
Just wanted to drop a post from the UK to say hello - loving the pics of everyone's completed blocks. I was going to buy the Great American Aran Afghan book but amazon took so long to send it I got a stitch manual out of the library instead and have been making up blocks from various stitches for my own afghan. I have wondered what weight you usually use, because I think you don't have aran weight wool in the US? I'll post pics of my own blocks when I've worked out flickr!
happy knitting
Carolyn