Mu split up, and reformed almost immediately as The Timelords . Borrowing sections of Gary Glitter's Rock 'n Roll and the theme from Doctor Who , they unexpectedly spent a week at number one in the UK with their single Doctorin' The Tardis .

After this bizarre accident, they wrote a book ( The Manual - How To Have A Number One Hit The Easy Way ) and split up, reforming almost immediately as The KLF . This was by far their most successful period, during which they invented ambient house music on their Chill Out album, and went on to become the UK's biggest selling singles act of 1991, with a string of top ten hits including What Time Is Love? , 3am Eternal , Last Train To Trancentral , Justified And Ancient and the American remix of What Time Is Love? , cunningly entitled America: What Time Is Love? , probably the most over-produced record ever made. This intensely busy period also saw them hit the top 10 under the Justified Ancients Of Mu Mu moniker, with It's Grim Up North , a