I started this so have only myself to blame
I only have to set up encryption on the wireless network if I use one of the company's machines to vpn in.
With the wife using two wireless printers and the daughter connecting with numerous gadetry, this causes major hassle.
The ISP password was shown in the clear and there was a 'key' field which looked like it was standing ready to show the 64 character seed. As I don't use one it was blank hence the question. For reasons moaned at above, too arduous to experiment.