Yep, have a few of each.
Have just heard back from the distributor of the handsets to say that the 5320 handsets are not supported in version 9.x of the software. Given that the drop down menu doesn't give us the option to pick the 5320s, that makese sense but I'm hoping that there's a way around this as a software upgrade or return of the handsets is not going to be easy.....
Thanks again for your direction bobcheese