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

Here is Why You Need An Adapter

The outlet and plug type used in South Sudan are C and D 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 South Sudan, outlets of type C and D are in use.

Type C

Type D

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