Thanks legacy1 and Sephiroth ! Emboldened by your advice, I connected up the Virgin Media Hub 3.0 to my Dell desktop, with Windows Vista. I can connect to the Internet perfectly via Ethernet cable, and I know there is a wireless transmission, because I can make a connection via my Kindle. However when I tried to gain access to the Hub 3.0i settings using the computer, a message told me that the password was incorrect. I suspect the problem is that the computer does not have the software which is required to make a wireless connection. This software, I gather, might cost about £15 - 40 for a USB adapter. Am I right in saying that I shall have to buy one of the adapters in order to operate the WiFi control panel, and so to switch off the WiFi?
Thanks legacy1 and Sephiroth ! Emboldened by your comments I joined up the Hub 3.0 today. The ethernet connection works fine but not the WiFi. I guess this is because the computer does not have the necessary WiFi adapter. I noticed the WiFi signal is being broadcast because I was able to join up my Kindle. However when I tried to gain access to the WiFi control panel, my password was rejected. Presumably I have to join up WiFi on the computer before I can disable it? I am wondering whether, if I brought my WiFi ready laptop home, I could use that to gain access to the WiFi control and disable it that way. Does that sound reasonable?