You Do Need power plug adapter while traveling from Wales to Aruba.

Here is Why You Need An Adapter

The outlet and plug type used in Aruba are A, B and F and in Wales is G. This is how they look like.

Wales

In Wales, outlets of type G are in use.

Type G

Aruba

In Aruba, outlets of type A, B and F are in use.

Type A

Type B

Type F