[1] Gladwell has played with numerous bands in the past 50 years and is perhaps best known for being the lead guitarist for Steve Harley and Cockney Rebel, firstly between 1990 and 1991, and then from 1999 until 2022 (sans 2018), playing both electric and acoustic guitars, as well as mandolin, in both Harley's full rock band format (Cockney Rebel), and Harley's 2–5 piece acoustic sets.
He also played lead guitar for Suzi Quatro during the 1990s, as well as many other musical artistes, and has supported and toured with the Rolling Stones, B.
Gladwell has also shared stages with David Gilmour and Tom Jones, among others.
The band is an established act in the Suffolk area, and as of 2024 continues to perform multiple concerts per year, with many of these played to raise money for local charities.
Gladwell has worked as a consultant for Gibson and Fender Guitars and wrote regular features for Guitarist magazine.