There's no Take That without the original fifth member to complete the group.

The British sensation have pleaded with former bandmate Robbie Williams to join them on their new U.K. tour.

The band - Gary Barlow, Mark Owen, Howard Donald and Jason Orange - have just announced plans for their 22-date "Beautiful World Tour" and want troubled Robbie to join them.

Howard said, "It would be lovely to have Robbie join us and let's just say we're keeping in touch about it. Having Robbie sing a few numbers would be amazing and we'll have to wait and see if he's up for it. We certainly are."

Robbie - who is undergoing treatment for addictions to prescription drugs in a rehab clinic - was mooted to appear with the band when they embarked on their reunion tour last year. However, the "Rudebox" singer - who left the band in 1995 - was only featured as a 20 feet pre-recorded hologram for the hit song "Could It Be Magic."

Since reforming, Take That have had a successful tour, a number one album, "Beautiful World," a number one single, "Patience," and won the BRITS British Single award.

Their 2007 arena tour begins in Birmingham on November 16. Tickets go on sale on Friday at 9 a.m.

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