The group are offering fans a double-disc version of their album 'Progress', which will include a second disc featuring eight brand new tracks ' including forthcoming single 'Love Love' - called 'Progressed'.

The songs on the album were recorded after sessions for 'Progress' ' their group's first album to feature returning member Robbie Williams since 1995 ' which was released last year.

An insider told Metro newspaper: "There are songs with lead vocals by Gary, Robbie and Mark on 'Progressed'.

"There are a couple of potential singles on the new record. The boys just continued writing after 'Progress' came out. The creative process was better than ever with Robbie back on board, so they just kept churning out ideas.

"They decided the tracks were just too good to let disappear into nothing, so they've finished them off in between rehearsing for the tour and are pretty happy with the results. It's their extra gift to loyal fans."

Another source revealed the new songs had been cherry-picked from a selection the band have written but not released.

Another source: 'They are a collection of the band's favourite songs from their recent recording sessions and have all finally been finished and mastered.'

'Progressed' will be released on June 13, shortly after their UK tour starts in Sunderland on May 27.