Cable hookup and av hookup
Connect your TV to AV1 and you SAT/Cable Decoder to AV2.
on the video select the AV2 channel and it will record whatever is connected to AV2. The AV channel selected it is the input the one not selected is the output.
Some PPV Movie channels are copy protected with some service providers. But most channels are recordable.
The aerial lead coming in your house connects to the SAT/Cable Decoder 1st, then connect the output socket on that to the Video/DVD then the output on that to the TV. As long as the leads you use have different ends on you CANNOT plug them into the wrong socket. As the the aerial passes through each device, the device adds its own RF channel to the feed, so you should be able to tune both a SAT/Cable and a Video/DVD channel onto the TV set aside from using AV/Scart.