parliamentary undersecretary 
noun
(In the UK) a Member of Parliament in a department of state, ranking below a minister.The person who interviewed David Lammy, the parliamentary undersecretary of state for health, for Emergency Medicine Journal makes an interesting observation....
- Chris Leslie, parliamentary undersecretary in the department of constitutional affairs, is worried.
- Hazel Blears has moved within the Department to become parliamentary undersecretary of state for public health.