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

Here is Why You Need An Adapter

The outlet and plug type used in United Kingdom (UK) is G and in San Marino are C, F and L. This is how they look like.

In San Marino, outlets of type C, F and L are in use.

Type C

Type F

Type L

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

Type G

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