The pair met service personnel, their families and civilian and military staff at the unit, based at the newly-opened Queen Elizabeth Hospital.
Prince Charles, who is a regular visitor to the unit, had invited Mr Cameron to join him for a tour of the Royal Centre for Defence Medicine’s (RCDM) dedicated ward for members of the armed forces wounded in Afghanistan.
Following the visit, the Prime Minister headed to the National Traffic Control Centre in Birmingham to meet staff and see the work they are doing to keep traffic moving during the extreme weather conditions.