Hi John
Thanks for the reply. I also received your PM, thank you! Actually, I relplied to that before I even read this

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You're right, I am studying Applied Linguistics. I started at the beginning of the year at USQ in Australia. I am an external student. We've been introduced to SFG and it's a hard one when you've been raised on the traditional structural grammar diet.
All the stuff I've been reading is online through the uni library. The one I've been reading most recently is Structure and Function: A Guide to Three Major Structural-Functional Theories by Butler. It's quite good. I've also read a website devoted to SFG which is really good. However, I am still unsure of the complexities of it all.
Must keep reading?!
M