When Ceefax launched, it was rumoured that there were only four teletext-capable TV sets in the whole UK - one in the BBC director general's office, one for the director of engineering, one at Kingswood Warren and one in Colin McIntyre's home.
As viewers got a small taste of what Ceefax had to offer, millions of Britons during the 1980s invested in new teletext-enabled TV sets which gave them access to the full Ceefax service, which by now included recipe details for dishes prepared on BBC cookery shows, share prices, music reviews and an annual advent calendar.
Digital TV offers a wider range of channels than analogue TV and much of the content available on teletext-based services can be accessed on digital sets.