I am still waiting for my ISP to get back to me. However, I have today connected through a router and find the licence from DHCP server is correct and as it should be on both cable and wireless.
The main cable connection (via the router) now shows a 192.168 etc address, but won't work in the Internet Zone. In Trusted Zone it works well. Wireless works OK in both. Should I leave the main connection in the Trusted Zone when the router is also connected?
The mystery remains as to why my licence is incorrectly issued when not using the router.