Answer by taking a quote from the following article:

Blur are an English rock band formed in Colchester in 1988. The group consists of singer/keyboardist Damon Albarn, guitarist/singer Graham Coxon, bassist Alex James and drummer Dave Rowntree. Their debut album Leisure (1991) incorporated the sounds of Madchester and shoegazing. Following a stylistic change influenced by English guitar pop groups such as the Kinks, the Beatles and XTC, Blur released Modern Life

After 13 and the subsequent tours in 1999-2000, band members pursued other projects. Graham Coxon recorded a string of solo albums, while Damon Albarn dedicated his time to Gorillaz, the animated band he had created with Jamie Hewlett. Alex James worked with Fat Les and co-wrote several songs with Sophie Ellis-Bextor and Marianne Faithfull.  Recording for Blur's next album began in London in November 2001, but concerted work started in June 2002, with the sessions moving to Marrakech, Morocco soon after, and then to Devon back in the UK. Not long after the sessions began, Coxon left the group. Coxon said "there were no rows" and "[the band] just recognised the feeling that we needed some time apart". Before the album was released, Blur released a new single, "Don't Bomb When You Are the Bomb" as a very limited white label release. The song is largely electronic, and was part of the band's protest against war in the Middle East. Albarn, however, attempted to assuage fans' fears that the album would be electronic by providing reassurances that the band's new album would be "a rockin' record", and also said that it has "a lot of finely crafted pop songs". Early in 2002, Blur recorded a song that would be played by European Space Agency's Beagle 2 lander once it touched down; however, attempts to locate the probe after it landed on Mars were fruitless.  Think Tank, released in May 2003, was filled with atmospheric, brooding electronic sounds, featuring simpler guitar lines played by Albarn, and largely relying on other instruments to replace Coxon. The guitarist's absence also meant that Think Tank was almost entirely written by Albarn. Its sound was seen as a testament to Albarn's increasing interest in African and Middle Eastern music, and to his complete control over the group's creative direction. Think Tank was yet another UK number one and managed Blur's highest US position of number 56. It was also nominated for best album at the 2004 Brit Awards. The band did a successful tour in 2003, with former Verve guitarist Simon Tong filling in for Coxon.  In 2005, XFM News reported that Blur would record an EP, and denied that they would hire a replacement guitarist for Coxon. There were also some aborted recordings made in 2005. Overall the band kept a low profile and did no studio or touring work as a three-piece. After Coxon significantly thawed on the subject of rejoining Blur, in 2007 band members announced that they would reunite, and that they intended to record together first in August, with the date later being pushed back to September, then October. Though the band members finally met up in October, they posted on their website that they had only "met up for an enjoyable lunch" and that there were no "other music plans for Blur".

what single was released from Think Tank
Think Tank was yet another UK number one