You Do Need power plug adapter while traveling from Saint Kitts and Nevis to Isle of Man.

Here is Why You Need An Adapter

The outlet and plug type used in Isle of Man are C and G and in Saint Kitts and Nevis are D and G. This is how they look like.

Saint Kitts and Nevis

In Saint Kitts and Nevis, outlets of type D and G are in use.

Type D

Type G

Isle of Man

In Isle of Man, outlets of type C and G are in use.

Type C

Type G