I have a power transformer that has 2 pins,, does it matter how it plugs into a uk adapter plug,,?

Question

it will fit the neutral and live on the uk adapter in two ways,, just have to unplug and rotate ,,it fits the live and neutral !

Answer 1

Though unstated, I presume that you are speaking of a 240 to 120 VAC transformer.  No, it doesn't matter which way you plug it in.  A transformer like this doesn't care which direction the current flows through it.  The only thing that will change is the polarity, but that is not important to your application.  

Good luck and have fun - 73 from the Fisherman