You Do Need power plug adapter while traveling from Saint Vincent and the Grenadines to Northern Ireland.

Here is Why You Need An Adapter

The outlet and plug type used in Northern Ireland is G and in Saint Vincent and the Grenadines are A, B and G. This is how they look like.

Saint Vincent and the Grenadines

In Saint Vincent and the Grenadines, outlets of type A, B and G are in use.

Type A

Type B

Type G

Northern Ireland

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

Type G