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

Here is Why You Need An Adapter

The outlet and plug type used in Northern Ireland is G and in Faroe Islands are C, E, F and K. This is how they look like.

Faroe Islands

In Faroe Islands, outlets of type C, E, F and K are in use.

Type C

Type E

Type F

Type K

Northern Ireland

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

Type G