Hi Paul, John, Peter and Fred.
I have now fitted a new B2B SD Card. This has connected to the BT Hub 6 first go so I am up and running again and able to use a Mobile or Laptop to control my B2.
At the moment I do not need the USB to Ethernet connection I was trying because my old SD card would not connect with The Hub 6 after having been connected to a Hub 5.
It may be of use in the future, if I were to set up the Ethernet connection at a later date. Is it possible to revert back to wi-fi again later if I wished to?
Anyway for the time being all seems to be working ok, many thanks to you all for your help.
Duncan