On leaving university, Sinclair joined a graduate training programme at Rothschild & Co in investment banking.
[6] In 2008, Sinclair was forced out of her public company Mission Capital and lost her subsequent High Court reinstatement fight.
Sinclair continues to comment on international politics and advocate entrepreneurship to the UK overseas.
In December 2016, she travelled to Delhi with Prime Minister Teresa May, James Dyson and British Indian entrepreneur Baron Bilimoria to meet Indian Prime Minister Narendra Modi to help promote better relationships between the UK and India.
[11][12] Sinclair has been a UNICEF advisor since 2014,[13] In 2022 in response to the 2022 Ukrainian refugee crisis, she gathered a consortium of over 200 companies to help provide english language training, resettlement skills, recertification and job opportunities for refugees arriving in the UK at scale with RefuAid.