You Do Need power plug adapter while traveling from São Tomé and Príncipe to Scotland.

Here is Why You Need An Adapter

The outlet and plug type used in Scotland is G and in São Tomé and Príncipe are C and F. This is how they look like.

São Tomé and Príncipe

In São Tomé and Príncipe, outlets of type C and F are in use.

Type C

Type F

Scotland

In Scotland, outlets of type G are in use.

Type G