Conversation so far:
What was the big reunion with Atomic Kitten?
The Big Reunion was an ITV2 series featuring Atomic Kitten
Why did Atomic Kitten get back together?
Atomic Kitten would reunite for an ITV2 series, The Big Reunion, along with five other pop groups of their time
Where did Atomic Kitten tour?
Due to the massive success of The Big Reunion, it was announced that the reunited groups would also be going on a Christmas party tour in December 2013.

Question: What was the tension about?
Self-contained rewrite: What was the tension with Atomic Kitten about?