Iron Lady: film about Margaret Thatcher, starring Meryl Streep

Meryl Streep never makes a bad movie (wait i will have to research that) and this film, Iron lady, is no exception.  the film is not so much about PM Thatcher and the 1980's, though that is shown, but it is more about maggie, the grocer's daughter, who had to rise up against a male dominated government and prejudice against her modest background (she actually waited on customers at her father's grocery store before going to Oxford.)  Much of the film is about Margaret as a senior lady, grieving the death of her husband, and of becoming slightly (?) dementia prone.  It begins with the Prime Minister visiting the local grocery store for a pint of milk, thoroughly out of touch with the diverse, modern London.  Or so it seems.  I really enjoyed the performance of ms. Streep, but wonder how the director, producers, selected her.  Its a british film, with an
american actor.  then again, I think Meryl has probably appeared on the London stage, and American actors enjoy a good presence in London (I am thinking about woody allen and the three films he made in London).  anyway, great film.  Much better than i anticipated.  And there was no Ronald Reagan appearance in it either - so much is made of Reagan and Thatcher by the reagan lovers - she was uniquely British, ronnie had nothing to do with her policies.  but she was an admirer of the american enterprise spirit.