The teletext service Ceefax will be switched off in the London area today (April 18).
The long-running analogue TV information service will be turned off after nearly 40 years as part of the ongoing switchover to digital TV.
Currently, the areas of Kent, Sussex, north-east England and Northern Ireland can still access Ceefax on analogue televisions.
Ceefax provided television viewers across the UK and Ireland with an interactive information news service decades before the arrival of the internet after it was launched in 1974.
The full interactive service will be turned off completely in October 2012 when the digital switchover is complete.
In London and other areas, Ceefax can be seen as Pages from Ceefax on BBC Two overnight until 6am, but it will not have an interactive function.
The service includes live news, sport, weather and travel information in real time, as well as shopping and gaming options.
Bamboozle - one of Channel 4 Teletext's most iconic quiz games - can be purchased as an app for the iPhone or iPad.
Ceefax, Telextext and Bamboozle have also been trending on Twitter following the announcement of Ceefax's closure in London today.
