I don't have any "legal department" to check with, it's just me as a person, and I am not so sure that there has to be a financial gain before dealing with restricted entities becomes against the law.
I would agree with Alan_M that my "first instinct" is to help anyone I could, but I am pretty sure that Britain as well as the USA has laws against what is called "trading with the enemy", and as I read the USA law, (but I sure ain't no lawyer) it seems like it is the responsibility of who ever is giving the advice, data or selling/shipping the parts/goods, to insure that the 'final end user' is not someone living in a country that our own countries have decided that pressuring the populace by an embargo rather than some other action (?military or espionage?).
So here is just about what I am wondering: Since Alan_m has expressed that he would be willing to provide assistance " irrespective of where they are in the world", under the US law, could I be held responsible by the US Government, if I gave data to Alan_m, with me knowing he was willing and quite possibly able to provide that same information to someone in one of the countries on the 'list'?
In other words, just how much "due diligence" is required?
I think it was A VP (of parts) from ClarkMH USA that went to prison for trying to ship forklift parts to Iran through a third country or 2.