Just watched it. I have to say that Seth Lakeman isn't my favourite musician, so maybe I'm biased, but after a burble by Ade Edmondson about folk songs carrying the stories and traditions of the country, we then got a short burst of Seth Lakeman singing a song he had written a month before and when Ade asked for its significance he said it was 'about the country and someone writing letters'.
Never mind, my opinion only and I expect lots of people thought it was brilliant.