Service Information was a regular slot in the early days of colour television in the United Kingdom that gave out engineering information for the radio and television trade. These announcements were made by the BBC continuity announcers of the time and were read over basic in-vision captions. The “programme” was broadcast on BBC2 during trade test transmissions and was not aimed at the general public or billed in the schedule. They went out three times a day 10.00a.m., 11.30a.m., and 2.30p.m. each weekday from 23 October 1967 to 1975, then once a day at 10.30a.m. from 1975 until the final broadcast on 23 December 1982. The IBA (and its predecessor, the ITA) had a similar programme called Engineering Announcements. Format In the days of early colour television in Great Britain the BBC2 daytime periods were filled with the colour test card and trade test colour films to help viewers and dealers to test and tune-in their television receivers. Clock Service Information bulletins would be preceded with a clock for two minutes and a catchy theme which was called Walk & Talk, played by the Syd Dale Orchestra, later replaced in 1978 with Swirly by Roger Limb. The clock was electronically recoloured in a variety of colour schemes in order to differentiate it from the clock used for BBC2's main presentation. Transmitters and relays The bulletin would then start with information regarding current transmitters and relays being either on reduced power or off air. This would then be followed with news of brand new transmitters and relays and when they were due to come on air. Details of trade shows or exhibitions next and anything else related to the technical development of colour television at the time. Then there would be a recap of the day's transmitter news followed by a caption showing the address of the BBC Engineering Information Department. Because the bulletin was designed for the trade, not the general public, a degree of prior knowledge was often assumed in the script - notably it was assumed people know where the transmitters mentioned despite the fact that many of them had interesting or unusual names. Trade test colour films The bulletin would then end with a rundown of the trade test colour films being shown on that particular day. "And now we are returning to the colour test card and music until Play School at eleven o'clock" would be