By the fall of 1931 Amstell had been drawn into the orchestra of Bert Ambrose, a seer of the British dance band scene who was eventually known, along with his entire band, as just plain Ambrose. A major stylistic development took place for Amstell in this group; he started concentrating on tenor saxophone, and by 1932 was taking the majority of the solos allotted to that instrument. The piece Tootin' Around was designed as a snug showcase for Amstell's tenor tootsies, first recorded by Ambrose in 1939. Into the late '40s, Amstell's chops kept him in the employ of a kind of triumvirate of hip British orchestra directors, including just plain Geraldo as well as Ambrose and Harris. He then worked in the BBC's own dance orchestra for five years, evolving into a studio player of great value to stylish session leaders of the '60s such as George Chisholm.
This type of work seems to have suited him well, and along with his prolific composing and arranging would amount to a contribution of great magnitude. In addition, Amstell's playing in the '80s once again changed course as he began blowing much more clarinet, joining the club of players whose opportunities to expose talents as a leader only develop when they are more than 60 years old. Session After Midnight, released on the Zodiac label in 1980, was hailed as a fine performance of swing. In 1986, he published his autobiography, entitled -Don't Fuss, Mr. Ambrose. At the age of 91, Amstell was reportedly still doing "the occasional gig." His younger brother, Mickey Amstell, was also a saxophonist. ~ Eugene Chadbourne, Rovi