BBC teletext service, Ceefax, was introduced, created initially to provide subtitling, but developed into a news and information service. In 1978, BBC staff went on strike just before the Christmas of that year, thus blocking out the transmission of both channels and amalgamating all four radio stations into one. Since the deregulation of the UK television and radio market in the 1980s, the BBC has faced increased competition from the commercial sector (and from the advertiser-funded public service broadcaster Channel 4), especially on satellite television, cable television, and digital television services. In the late 1980s, the BBC began a process of
Teletext to the TV station. These services have since been superseded by the World Wide Web. With the advent of digital television some countries adopted the name "digital teletext" for newer standards, despite the older teletext standards' digital nature. "Digital teletext" is encoded with standards including MHEG-5 and Multimedia Home Platform (MHP). Other countries use the same teletext streams as before on DVB transmissions, due to the DVB-TXT and DVB-VBI sub-standards. Those allow the emulation of analog teletext on digital TV platforms, directly on the TV or set-top box, or by recreating analog output, reproducing the vertical blanking interval data in