Answer by taking a quote from the following article:

The Sugababes are a British girl group formed in 1998 by Siobhan Donaghy, Mutya Buena and Keisha Buchanan. Their debut album, One Touch, was released in the UK through London Records on 27 November 2000. The album achieved moderate success, peaking at number 26 in April 2001 and eventually being certified Gold. In 2001, Donaghy departed the group amid rumours of a rift with Buchanan and the group were dropped by their record label.

The Sugababes were formed in 1998 by All Saints manager Ron Tom. Siobhan Donaghy and Mutya Buena, both aged just 13, had been signed as solo artists, but decided to work together after performing at the same showcase. While working in the studio, Buena invited her best friend Keisha Buchanan to watch them. Manager Tom decided the three girls were to be a trio, likening their different appearances to the United Colors of Benetton campaign. Originally dubbed the Sugababies, the group's name was tweaked to Sugababes when they were signed by London Records to give the group a more mature image.  The group's debut single, "Overload", peaked at number 6 on the UK Singles Chart in 2000 and was nominated for a BRIT Award for Best Single. The group co-wrote most of the tracks on debut album One Touch with the help of All Saints producer Cameron McVey. One Touch peaked at number 26 on the UK Albums Chart. The album produced three more top 40 hits--"New Year", "Run for Cover" and "Soul Sound". The sales of One Touch did not meet London Records' expectations, and they dropped the group in 2001. It was later certified gold by the BPI and had sold 220,000 copies in the UK by 2008 according to Music Week.  During a Japanese promotional tour in August 2001, Donaghy left the group. She stated initially that she wanted to pursue a fashion career, but was eventually diagnosed with clinical depression amid reports of in-fighting amongst the group's members. Donaghy later stated that she was forced out of the group by Buchanan and called Buchanan the "first bully" in her life. Former Atomic Kitten member Heidi Range was announced as Donaghy's replacement.

What is a record label that they were signed to?
they were signed by London Records