Is it suitable for use with my 1999 Sony Tele/Video combi and freeview digi box?
If your TV has a spare scart or composite video input you should be ok. You will need to buy a cable to connect to the BNC output on the back of the DVR as well.
I have bought some of those interior dome cameras and the build quality isn't brilliant although the camera picture is good. The DVR looks fine but I make sure you will get enough record time for your needs on 250GB with 4 cameras.