When I connect my Macbook air to my TV, using a Mini Display Port/HDMl adaptor and an HDMl cable, the only thing that appears on the TV screen is the Air's background screen,

When I connect my Macbook Air to my TV via the thunderbolt outlet and using a Mini Display Port/HDMl adaptor, the only image that appears on the TV screen is that of my Air background. There is obviously a signal getting through to the TV, but it is not sending images of anything else, and am unable to watch video through my Air. Any advise/suggestions?

This is called "extended desktop mode".  It's an extension of the desktop off to the right (by default) of your MBair screen.  Grab an app and drag it off the right side of your MBair screen and it will appear on the TV.
To mirror your MBair screen on the TV you can press Command F1.  This will toogle between mirror and extended desktop.
You can find all the settings in System Preferences > Displays > Arrangement tab.
Regards,
Captfred

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