Just in case anybody (everybody?) is wondering what gives...
'The song is well known for an incident on the popular BBC UK music show Top of the Pops, when the group, ready to do a mimed (as was BBC policy at the time) performance of their hit, were not played the backing track through their monitors, so they sat motionless while the television and studio audience could hear the song. Due to this error on the part of the BBC, the band were invited back the following week and insisted on playing the song live.'