You Do Need power plug adapter while traveling from Bangladesh 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 Bangladesh are A, C, D, G and K. This is how they look like.

Bangladesh

In Bangladesh, outlets of type A, C, D, G and K are in use.

Type A

Type C

Type D

Type G

Type K

United Kingdom (UK)

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

Type G