Gary Barlow has reportedly blasted X Factor guest judge Geri Halliwell, saying he will quit if she ever returns to the show.

The Take That singer accused the Spice Girl of “trying too hard” when she attended the Liverpool auditions, and hinted that she was not popular with the crowd.

She’s crackers,” he told The Sun. “How you see her on TV is exactly how she is in real life. The crowd really didn’t like her. She got booed all day long. She was a bit over-excited.”

“I do love her for being her, though, we had fun backstage. She’s sweet but mad.”

But when asked if she may return, Gary added, “I doubt it. And if she is, I may be going.”

And he was more enthusiastic about fellow Spice Girl Mel B, saying she was “briliant” on the show, and adding, “It actually gave me a bit of a holiday the day she was there.

“I’m normally the one who delivers the bad news but she was doing it all,” he explained, “so I could just sit there, going, ‘Oh, that’s awful, what she said’ but secretly loving it.”

Meanwhile Gary revealed that he had hatched plans for Cheryl Cole to join him at the judges’ houses – news which was kept top secret until filming began last weekend – when they both performed at the Diamond Jubilee concert in June.

“We’ve always been quite close and when we did the Jubilee together, I thought, ‘I wonder if she would’,” he recalled.

“I knew it would be great for my acts to be watched by someone who has so much experience in this competition. That’s invaluable.”