[2][3][circular reference] He was formerly a government junior minister [unpaid] at the UK's Department of Health and Social Care.

[4][5] Markham was appointed Commander of the Order of the British Empire (CBE) in the 2022 Birthday Honours for services to the economy and government.

[6] At the beginning of the pandemic, he set up a charity, Project Little Boat, to deliver PPE and other essential equipment,[7] with Denis Kinane.

Markham then co-founded Cignpost Diagnostics with Denis Kinane and Steve Whatley and is the Commercial Lead responsible for building the business.

[12] Previously he was the lead non-executive director for the Ministry of Housing, Communities and Local Government since January 2013, where he also chaired the Audit and Risk Committee.