You Do Need power plug adapter while traveling from United States of America (US) USA to Great Britain.

Here is Why You Need An Adapter

The outlet and plug type used in Great Britain is G and in United States of America (US) USA are A and B. This is how they look like.

In United States of America (US) USA, outlets of type A and B are in use.

Type A

Type B

In Great Britain, outlets of type G are in use.

Type G

I am from

going to