I've just this minute solved the problem as I found a later driver for Atheros AR5007 and once installed it solved the problem. Here's a link to the latest driver in case it helps someone else.
Thanks for your help.
Thats good, the HP site is quite difficult to navigate, but you have done well to locate the updated driver on the forums
This is the direct link to the driver file itself ftp://ftp.hp.com/pub/softpaq/sp53001-53500/sp53261.exe
It was driving me dippy and I hate to be beaten No housework done here for a few days and it's well past my lunch time lol. I'm even more determined when I'm hungry.