For which UK pop group was Les Gray the lead singer?

"Mud" (now "Mud II") are an English glam rock band, formed in February 1966. Their earlier success came in a pop and then glam rock style, while later hits were influenced by 1950s rock and roll, and are best remembered for their hit singles "Tiger Feet", which was the UK's best-selling single of 1974, and "Lonely This Christmas" which reached Christmas number 1 in December 1974. After signing to Rak Records and teaming up with songwriters/producers Nicky Chinn and Mike Chapman, the band had fourteen UK Top 20 hits between 1973 and 1976, including three number ones.

The band was founded by lead guitarist Rob Davis (born Robert Berkeley Davis, 1 October 1947, Carshalton, Surrey), lead vocalist Les Gray (born Thomas Leslie Gray, 9 April 1946, Carshalton, Surrey), drummer Dave Mount (born David George Mount, 3 March 1947, Carshalton), and bassist Ray Stiles (born Raymond John Stiles, 20 November 1946, Guildford, Surrey).

Les Gray was a self-taught musician, and during his school years, he played trumpet with a jazz band, and then, with a younger brother, went on to form the skiffle unit, "The Mourners". After leaving school he worked for Pearl & Dean, writing commercials, and later for Moss Bros before finding success with "Mud".

In 1992, Gray moved with his wife Carol to live in the Algarve region of Portugal. He died on 21 February 2004, of a heart attack, whilst fighting throat cancer.