Electric Shock - power cable issue?

I've recently been getting electric shock of my laptop and also the rest of the flat. Its been this way in 2 different places I live and only happens after plugging in the laptops after an hour or so.

There 3 things I think it could be:

1) A faulty power adaptor?

2) The first part of the power cord is a  5amp -250V rated cord. Is this the correct one?

3) Some issue with the laptop itself?

Anyone with any suggestions please??

@redxps630

@speedstep 

@bradthetechnu