The band's third studio album, Loco, was released in early 2001. Back under EMI, the album had all new songs including the eponymous single which became their biggest hit yet, reaching No. 5 in the UK Singles Chart. It was the only single release from the album to reach the UK Top 40, and its success helped Loco to reach No. 5 in the UK Albums Chart.  Their final album under EMI was a "best of" compilation called Bag of Hits released in 2002. It was released in both one and two disc versions, with the second disc featuring remixes of Fun Lovin' Criminals songs by other artists. EMI released this album against the wishes of the band, who were not happy with the two disc version. However, despite their objections it reached No. 11 in the UK Albums Chart.  After parting company with EMI the band was picked up by Sanctuary Records in the UK, under which they released their fourth studio album Welcome to Poppy's (2003). While it received strong, but not fantastic, music reviews it failed to live up to the commercial success of any of the previous albums, peaking at No. 20 in the UK Albums Chart. The best-selling single from the album reached No. 61.  EMI continued to release the band's back catalog, as well as unreleased songs on two more albums. The Fun Lovin' Criminals made no further releases until 2005 album Livin' in the City, still under Sanctuary Records. This was very much a love letter to New York with many songs extolling the virtues of the city.  In June 2008 they made their second appearance at the Glastonbury Festival, this time on the Jazz World Stage.

Answer this question "reaching what?" by extracting the answer from the text above.
to reach the UK Top 40, and its success helped Loco to reach No. 5 in the UK Albums Chart.