Dianne began her career in a variety of marketing roles with companies such as Co- operative Wholesale Society, ICI, Sterling Roncraft and Woolworths. She was Managing Director of Sandvik, a Swedish steel company and spent fourteen years as CEO of Camelot. Dianne also lectured at universities and started her own advertising agency, Thompson Maud Jones in Manchester. She retired from Camelot in November 2014 and is now President of the Market Research Society and a non-executive director on the board of Next, as well as running a hotel on the Isle of Wight.
In 2001 she was awarded the Veuve Cliquot Business Woman of the Year award. Five years later she was awarded a CBE and in 2015, a Damehood. She is a regular attendee at the Women of the Year lunch and has sponsored tables and held positions on the committee. She is a longstanding member of the Women in Advertising and Communications London and has served on the executive committee for many years as well as being its President.