Hi Mammysboy
I had the same problem and rang them to order.
Before you buy, ake sure that they tuner they supply is on the Microsoft Designed for MCE list (see Microsoft site) - Dell provided me with a tuner that functioned under XP but did not allow me to use the MCE TV functionality. This was when Dell had just started selling MCE in Ireland.
Also, I'd recommend a built in or USB stick tuner (if using a laptop) as the stand alone external one that I eventually bought does add to the clutter around the TV.
Highly recommned MCE for TV. Good luck.
Lanky