You Do Need power plug adapter while traveling from Iraq to United Kingdom (UK).

Here is Why You Need An Adapter

The outlet and plug type used in United Kingdom (UK) is G and in Iraq are C, D and G. This is how they look like.

Iraq

In Iraq, outlets of type C, D and G are in use.

Type C

Type D

Type G

United Kingdom (UK)

In United Kingdom (UK), outlets of type G are in use.

Type G