You Do Need power plug adapter while traveling from Northern Ireland to Djibouti.

Here is Why You Need An Adapter

The outlet and plug type used in Djibouti are C and E and in Northern Ireland is G. This is how they look like.

Northern Ireland

In Northern Ireland, outlets of type G are in use.

Type G

Djibouti

In Djibouti, outlets of type C and E are in use.

Type C

Type E