[7] In 1980, Dinesh and his wife Tani started selling travel tickets from a kiosk at Earl's Court tube station in London.

The firm grew rapidly and, in 1987, was appointed General Sales Agent for Royal Nepal Airlines in the United Kingdom and Ireland.

More recently, he was the founder and chairman of the Copper Beech Group, a firm involved in residential property development in Romania and education infrastructure in India.

He took unsuccessful legal action in the High Court against his party to take the top list position, on the basis of being a minority ethnic candidate and Liberal Democrats diversity targets.

Dhamija is a member of the think tank, Bridge India[13] and wrote a blog article for the organisation on the Asia Pacific Trade Deal in April 2023.