Here's an easy quick guide to types of box.... There is only two types

You have a normal set top box that can recieve free to air digital terrestrial TV - Freeview. All this does is recieve and decode Freeview channels. You connect your aerial lead to the box, then the box to your TV using a scart lead, and you watch Freeview on your TV on the AV channel.

Within this type of box there are some varients - some boxes have a singel scart (for the TV) some have two scarts (1 for TV 1 for the VCR/DVD-recorder) and the new Goodmans one has HDMI output (it doesn't do hi-def, it just upscales it)

Next, you have PVR's (also known as DVR's) - Personal (Digital) Video Recorders. A Freeview PVR will be a box that recieves Freeview signals, and has an internal HDD fitted to record the programmes. Most of these have twin tuners in the box - so you can record one programme and watch a different channel, or record two different programmes at the same time. All of the above apllies to these boxes aswell.