You Do Need power plug adapter while traveling from Chad 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 Chad are C, D, E and F. This is how they look like.

Chad

In Chad, outlets of type C, D, E and F are in use.

Type C

Type D

Type E

Type F

United Kingdom (UK)

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

Type G