My passport if full of Cuban exit permissions (since I have residency here). I regularly enter the US without any comment. (I include Cuba on the list of countries previously visited, too).
I once got an extra search leaving the US.
(Aside, my ex-wife claims that when she went to the US Interests Section, she said that I was "financial controller", and they looked on their computer and corrected her - actually "finance director".)
With the UK's move towards ID cards, things are getting more controlled there. Yes - the Cuban government tries to control its people. Yet I know people with duplicate ID cards, I know one cubana who got a friend to change the records to amend her daughter's surnames (to take the father's surname off). I doubt those sort of things will be as easy in the UK.
