For the first few years, the BBC produced videotapes in both VHS and Beta-max formats. The company also worked with Philips on early Laserdisc releases, including a notable ornithology disc called "British Garden Birds", presented by David Attenborough. This disc was published in 1982 and included digital data in the form of Teletext, which could be read by any suitably-equipped television. This pioneering use of a data channel on a consumer video format led directly to the development of the BBC Domesday Project in 1984–1986. Since videos could have stereo soundtracks, BBC Video produced stereophonic versions of many programmes that had been broadcast in mono. These included "The Hitch Hiker's Guide to the Galaxy" (although release was delayed for lack of an Equity agreement) and the wedding of Charles, Prince of Wales, and Lady Diana Spencer.