The British Broadcasting Corporation (BBC) is a British public service broadcaster, headquartered at Broadcasting House in Westminster, London. It is the world's oldest national broadcaster, and the largest broadcaster in the world by number of employees, employing over 22,000 staff in total, of whom more than 16,000 are in public sector broadcasting.
The total number of BBC staff amounts to 35,402 including part-time, flexible, and fixed-contract staff.
The BBC provided the world's first teletext service called Ceefax (near-homonymous with "See Facts") on 23 September 1974 until 23 October 2012 on the BBC 1 analogue channel then later on BBC 2. It showed informational pages such as News, Sport and the Weather.
During its lifetime it attracted millions of viewers, right up to 2012, prior to the digital switchover in the United Kingdom. It ceased transmission at 23:32:19 BST on 23 October 2012 after 38 years. Since then, the BBC's Red Button Service has provided a digital-like information system that replaced Ceefax.
To receive a desired page of text on a Ceefax-capable receiver, the user would fumble around with the appropriate buttons on the device. Once coded in, this page would update on the user's screen as and when appropriate.
According to en.wikipedia