I was invited to the BIBBA Conference on the Isle of Man this year to talk about top bar hives. This is my talk, lightly edited to remove the soundtrack of a video at the end.  My talk was introduced by Johnny Kipps, a resident of the island, who took me to see his top bar hives during one of the lunch breaks. You can see the video of his hives, complete with local black bees, here https://youtu.be/jRebDnqj-wc