The video by Kenneth Griffith dealing with Michael Collins was entitled "Hang out your Brightest Colours" which was apparently taken from a quote by George Bernard Shaw in a letter to Michael's sister after his death. Shaw was trying to comfort the grieving relatives by saying that Michael died a hero's death and how much better that was than if he had died wheezing in bed an old worn out man. Yes - the programme was finally shown some 25 years after it was made. Griffith is still a powerful voice in television and his most recent programme was one about the Boer War. He has also done a programme about another grear Nationalist - Roger Casement.In regard to the question about The Foggy Dew" having an English origin, it hasn't. The English song is called "The Foggy, Foggy Dew" and has a different theme and air.
You will be spoilt for choice about works on Michael Collins both in books and video. Try and get hold of a video called "The Treaty" which deals in detail with the negotiations. One of the best features of it is that the producers did their best to get actors who were near as dammit the images of the main people. Brendan Gleeson who plays Michael Collins is more like the real Collins than Liam Neeson. Film fans will recognise the name as the actor who played the real life villian Martin Cahill in "The General." Try also and get the book entitled "Michael Collins - The Man who Won the War" by T.Ryle Dwyer. ISBN 0-85342-931-6. Good luck M