Do'h! silly me.
Tried the card in a friends iPAQ and it worked fine. Then put the Sharp ROM on my Zaurus and tried it in that, it worked fine with no encryption, but wouldn't work with WEP still.
Double-checked and realised my WEP key wasn't 13 characters long (in text). Do'h!
My LP wifi card is now working under 3.5.4.1-alpha2 on hentges rom, albeit it atm with WEP.
Still it is better than not working at all for now.
Kelly