How does Prestel works? by Logica / BVT Marketing.
Prestel, cover from 1982
Prestel / Viewdata (1979)
Prestel, screengrabs from 1984
Here you can view the graphics as text.
Prestel (abbrev. from press telephone), the brand name for the UK Post Office’s Viewdata technology, was an interactive videotex system developed during the late 1970s and commercially launched in 1979.
Terminal/demonstration at the National Museum of Science & Industry