Thanks to all for the responses, it's much appreciated. Yep, the lead from the console fits straight into the back of the TV, so I fired it all up and popped a game cartridge in. The console itself seems to attempt some kind of auto tune on a blank channel, making a beeping noise as it goes (which I vaguely remember from the 80s) but so far no luck getting it up and running, even with a manual tune. I've flipped the channel switch on the bottom of the Atari between 'A' and 'B' to no avail too. Think it's our modern telly not liking it but I'll have another go.
Darn it, I'm dying to revisit Skydiver and Outlaw, and a mysterious looking Warriors game that I don't even remember buying back in the day.
Chopper Commander - no fancy graphics needed for me, heh heh, Atari is the only system I've ever played on so the modern ones scare me with their lifelike creations!
Thanks again all, really do appreciate the advice.
Poppy