OK, I tested it last night and had no joy with 2 networks. I tried this morning and was getting ARPs back from another, but didn't want to sit around long enough for it to crack the password.

It appears to be working if you follow the instructions, and I'm only interested in this as 'proof of concept'.

Thanks for your hard work and giving me something else to play with!

@ kingodball, do you frequent the Whirlpool Forum N900 thread as well, as it states that you are in Australia?