A source close to the band claims the group made a pact to keep their goodbye secret
This year's official Children In Need Single released in November
Girl band also confirm they will release greatest hits album 'Ten' in November
Group have shifted 4.3m singles since their 2002 debut 'Sound Of The Underground'
Pop group's new track hits the internet
The pop group will finish after greatest hits album and tour
The girl group will be revealing their reunion plans next week
Group will play comeback show in front of the Queen for 10-year anniversary