1. Adele: Known for her powerful voice, Adele has achieved global success with hits like "Someone Like You," "Hello," and "Easy on Me." She has won numerous awards, including 15 Grammy Awards and 18 Brit Awards.
2. Amy Winehouse: Amy Winehouse was a talented singer and songwriter known for her unique blend of jazz, blues, and R&B. Her album "Back to Black" is considered one of the greatest albums of all time. Unfortunately, her career was cut short due to her untimely death in 2011.
3. Annie Lennox: Annie Lennox rose to fame as part of the duo Eurythmics, with hits like "Sweet Dreams (Are Made of This)." As a solo artist, she has also achieved success, known for her strong voice and socially conscious lyrics.
4. Dua Lipa: Dua Lipa emerged in the early 2010s and quickly gained popularity with her catchy pop songs, including "New Rules" and "Don't Start Now." She has won various awards, including a Grammy Award and two Brit Awards.
5. Florence Welch: Florence Welch is the lead vocalist of the band Florence and the Machine. Her unique voice and energetic performances have won critical acclaim and commercial success with songs like "Dog Days Are Over" and "Shake It Out."
6. Kate Bush: Kate Bush is regarded as one of the pioneers of progressive pop music. She gained fame in the 1970s with hits like "Wuthering Heights" and has continued to release critically acclaimed albums and experimental music throughout her career.
7. Ellie Goulding: Ellie Goulding is a singer and songwriter known for her electronic-infused pop music. Some of her popular hits include "Burn," "Lights," and "Love Me Like You Do."
8. Leona Lewis: Leona Lewis rose to fame after winning the third season of the UK's "The X Factor" in 2006. Her debut single, "Bleeding Love," became a global hit.
These are just a few examples of talented and successful female British singers, but the list could extend further since different individuals may have varying musical preferences and opinions on who holds the title of "the best."