For contractual reasons, he changed his name to Ariel Bender at the suggestion of singer-songwriter Lynsey De Paul for his stint with the Mott the Hoople. According to Mott's lead singer Ian Hunter, interviewed in the documentary The Ballad of Mott the Hoople, the band were in Germany with Lynsey De Paul for a TV show when lead guitarist Mick Ralphs walked down a street bending a succession of car aerials in frustration. De Paul came out with the phrase "aerial bender" which Hunter later suggested to Grosvenor as a stage name. Grosvenor joined the band in 1973, replacing Ralphs. Grosvenor toured with Mott in 1973 and 1974 and performed on the band's seventh album, The Hoople (1974).
The years with Spooky Tooth (1967 to 1970), Stealers Wheel (1973) and Mott the Hoople (1973 to 1974) were the most successful years in Grosvenor's musical career. After leaving Mott in 1974 - he was replaced by Mick Ronson - Grosvenor published a few solo albums, and formed Widowmaker, releasing Widowmaker in 1976 and Too Late to Cry in 1977.
In the 1990s, Grosvenor returned in a Spooky Tooth reunion. In 2005, he revived his pseudonym, forming the Ariel Bender Band. In 2007 and 2008 he performed under the name Ariel Bender's Mott The Hoople performing both Spooky Tooth and Mott The Hoople songs, as well as cover songs.
In 2009, he worked with London act, The Winter Olympics, recording guitar parts for their song, "The Great Outdoors", which was released in August 2010.