Cheers, I've found myself reading that section a good few dozen times
![Tongue](https://bitcointalk.org/Smileys/default/tongue.gif)
Unfortunately it doesn't really apply to my situation as the automatic payment method doesn't work as detailed, nor does the manual option.
I guess it could be the site being fussy, though I'm not sure how - the messages I'm getting, although not very detailed, are being displayed successfully and ultimately for a reason.
I'll keep trying though and would love any more suggestions people might have!
![Smiley](https://bitcointalk.org/Smileys/default/smiley.gif)