<sniff>! Aah, the smell of severalteen year old unused technology! I'd be tempted to use this, but sadly there isn't a Prestel service any more!
The keyboard on this unit is an infra-red one so you could sit the main unit on top of the telly, plug it into the TV, mains and phone and sit in comfort on your sofa racking up a huge Prestel bill since it charged you by the page!