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

Here is Why You Need An Adapter

The outlet and plug type used in Pitcairn Islands is I and in United Kingdom (UK) is G. This is how they look like.

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

Type G

In Pitcairn Islands, outlets of type I are in use.

Type I

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