A Royal Night Out (Blu-ray release 2015-9-7) is a fictional account of princess Elizabeth and Margaret going out to the street to join the crowds in celebrating the end of World War II.  They face dangers like jumping on to the wrong bus without money and drinking alcohol with strange men, but a reluctant hero saves them.  I cannot say this movie is interesting, but its recreation of the London celebration in 1945 looks awesome.  I think The Princess Diaries (2001) was far more entertaining.