Thanks for that. 14 days should be enough for my needs. And depending on how a current ebay sale ends up I may have the wonga to buy the license in the next couple of days anyway. It will depend upon the auction winner paying up.
I just noticed that when I select to upgrade my Express Talk business license it offers me a substantial discount for this PBX software, which is more than handy. At the moment I'm running Express Talk on my client PC, but intend to move the call management to my server.