" 2 Become 1 " was originally going to be released in the UK on 9 December 1996 , but the release date was delayed to let Dunblane 's " Knockin ' on Heaven 's Door " — a tribute to the children killed at the Dunblane Primary School in Scotland — to stay at the top of the UK Singles Chart . The single was released the next week , debuting at the top , becoming the group 's third chart-topper and their first Christmas number-one single in the UK . It sold 209,000 copies in the first three days of release and 462,000 in the first week , becoming the fifth best-selling single of the year . " 2 Become 1 " sold 1.14 million copies in total , giving the Spice Girls their second and final million-selling single in the UK.Despite being released during the final two weeks of 1996 , " 2 Become 1 " was the 5th best seller of the year
Dunblane Primary School
Dunblane massacre
2 Become 1