You Do Need power plug adapter while traveling from Antigua and Barbuda to Great Britain.

Here is Why You Need An Adapter

The outlet and plug type used in Great Britain is G and in Antigua and Barbuda are A and B. This is how they look like.

Antigua and Barbuda

In Antigua and Barbuda, outlets of type A and B are in use.

Type A

Type B

Great Britain

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

Type G