OK, ActivePrint Trial worked out pretty well!
There was better formating on the printed documents than I was getting from HP Mobile Printing, I suppose ActivePrint retains more than the HP proggy did.
The ActivePrint does work well on a wireless network -
BUT - (yeah, BIG but) unlike HP Mobile Printing which sends directly to the printer, you must have the companion ActivePrint program installed on at least one computer on the network and that computer -
must be on - when you want to print. HP Mobile Printing did not require this.
I don't think it is a big deal, my PC is usually on, but I did get a little annoyed when I had to boot up the PC when testing the software - at first I didn't think it worked!!!

Basic version for ActivePrint will cost you $20 I believe, HP was free...