Top of the Pops, also known as TOTP, is a British music chart television programme, made by the BBC and originally broadcast weekly between 1 January 1964 and 30 July 2006. It was traditionally shown every Thursday evening on BBC One, except for a short period on Fridays in mid-1973 before being again moved to Fridays in 1996 and then to Sundays on BBC Two in 2005. Each weekly programme consisted of performances from some of that week's best-selling popular music artists, with a rundown of that week's singles chart. Additionally, there was a special edition of the programme on Christmas Day (and usually, until 1984, a second such edition a few days after Christmas), featuring some of the best-selling singles of the year.

From 1967, the show had become closely associated with the BBC radio station Radio 1, usually being presented by DJs from the station, and between 1988 and 1991 the programme was simulcast on the radio station in FM stereo. However, during the last few years of the 1980s the association became less close, and was severed completely (although not permanently) in a radical shake-up known as the 'Year Zero' revamp.  Following a fall in viewing figures and a general perception that the show had become 'uncool' (acts like The Clash had refused to appear in the show in previous years), a radical new format was introduced by incoming executive producer Stanley Appel (who had worked on the programme since 1966 as cameraman, production assistant, director and stand-in producer) in October 1991, in which the Radio 1 DJs were replaced by a team of relative unknowns, such as Claudia Simon and Tony Dortie who had previously worked for Children's BBC, 17-year-old local radio DJ Mark Franklin, Steve Anderson, Adrian Rose and Elayne Smith, who was replaced by Femi Oke in 1992. A brand new theme tune ('Now Get Out Of That'), title sequence and logo were introduced, and the entire programme moved from BBC Television Centre in London to BBC Elstree Centre in Borehamwood.  The new presenting team would take turns hosting (initially usually in pairs but sometimes solo), and would often introduce acts in an out-of-vision voiceover over the song's instrumental introduction. They would sometimes even conduct short informal interviews with the performers, and initially the Top 10 countdown was run without any voiceover. Rules relating to performance were also altered meaning acts had to sing live as opposed to the backing tracks for instruments and mimed vocals for which the show was known. To incorporate the shift of dominance towards American artists, more use was made of out-of-studio performances, with acts in America able to transmit their song to the Top of the Pops audience "via satellite". These changes were widely unpopular and much of the presenting team were axed within a year, leaving the show hosted solely by Dortie and Franklin (apart from the Christmas Day editions, when both presenters appeared) from October 1992, on a week-by-week rotation.

Using a quote from the above article, answer the following question: What caused them to be less close?
Following a fall in viewing figures and a general perception that the show had become 'uncool' (