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

Here is Why You Need An Adapter

The outlet and plug type used in Lebanon are C, D and G and in United Kingdom (UK) is G. This is how they look like.

United Kingdom (UK)

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

Type G

Lebanon

In Lebanon, outlets of type C, D and G are in use.

Type C

Type D

Type G