I'm going on tour with Take That, says Robbie Williams

Newly-reunited Take That stars Gary Barlow and Robbie Williams revealed today that the band would definitely tour - but the collaboration may not be permanent.

The duo, who have recorded a single - Shame - together which was premiered today, said the group's only firm plans are for an album and live shows.

After 18 months working, the future is uncertain and they may go their separate ways, they admitted as they appeared on BBC Radio 1 this morning to unveil the single.

The group and Williams had bickered for more than a decade after he left for a solo career. They cleared the air after more than a decade of feuding when they met up in Los Angeles around 18 months ago.

Last month they announced they had recorded an album.

Today the pair confirmed they were plotting their live show - but anything beyond that was uncertain.

Asked about the future, Barlow said: "I don't know the answer to that. We agreed when we started - it's 20 years since we began, it's our 20th year for all of us - to do a one-off album and maybe a one-off tour would be a great thing this year.

"But I think once we've done that, Rob will go back to being Rob, we'll go back to being a four. I think it will resume to how it was."

Williams added: "The thing is, the door is open to do whatever we want. We've got 18 months planned. Whatever happens after, whatever happens after that. We haven't decided."

Barlow said of live plans: "We are talking about a tour right now, so hopefully next summer we will tour."

The pair also spoke of the night they put their differences aside to reform the hugely popular group.

The five Take That members met up 18 months ago in Williams's home city of Los Angeles, California, after keeping their distance since 1995.

In their first joint interview in 15 years, Barlow admitted that he felt guilty about not looking out for Williams, who was the younger member of Take That.

"I think we had a lot of guilt, the four of us, because Rob was the youngest, the most impressionable of all of us. We always felt like we didn't look after him enough."

The pair got together for a "big chat" when Mark Owen, Jason Orange, Howard Donald and Barlow were in LA mixing The Circus album.

Williams said in an interview on Radio 1: "It is one of those situations in life that could be very explosive and could go completely wrong.

"We had that big chat and the most amazing thing happened at the end of it. We both said sorry to each other and we both meant it and that was all we needed.

"It just lifted so much off my shoulders that I didn't know was still there."

Barlow added: "I spent the last 15 years thinking about what I was going to say."

The pair were debuting their joint single Shame on Radio 1's Chris Moyles show. The track includes an acoustic guitar part reminiscent of Sir Paul McCartney's song Blackbird, which he recorded with the Beatles.

The video for the song - to be included on his greatest hits album later this year - was also premiered on Williams's website.

In a sign that their dark years were behind them, Williams and Barlow embraced in front of fans as they arrived at the Radio 1 studios in central London this morning.

Recalling their clear-the-air meeting, Barlow said: "All these things had been built up for so long it just sounded stupid as it was coming out. We just needed to sit opposite each other and talk.

Williams added: "We are a bit older, a bit wiser, I think that our egos have diminished a little bit.

"It was the start of a very magical 18 months that we had together since then, writing songs together, getting to know each other."

The pair's new song, based on their relationship, was written in an hour, said Williams.

Barlow said: "We are really enjoying each other at the moment and I do feel like our work in the studio is actually just beginning.

"We have got off to a great start and we are enjoying working with each other so much, we do it over the internet, we do it whenever we can."

The similarity between Shame and the Beatles song was not lost on listeners.

Many people took to social networking site Twitter to point out the coincidence.

Blackbird was released on the Fab Four's 1968 album The Beatles, more commonly known as the White Album, and features just Sir Paul playing an acoustic guitar.

One Twitter user wrote: "Is it me, or does the Robbie/Gary song rip off Blackbird by The Beatles?"

Another wrote: "Gary Barlow & Robbie's latest song sounds an awful lot like 'Blackbird' by The Beatles."

But the track was a big hit with Williams's fans, who were delighted the pair were recording together again.

"Lovely song. So great to see you two together," wrote one fan on Williams's website.