Steve Gardham wrote
"Hi Tzu,
Have to disagree I'm afraid. I thought the orchestral bits were the best part and I'm a died-in-the-wool folkie of some 50-odd years."

As someone who went to his first folk club over 60 years ago (not really playing one-upmanship, Steve!) I would have to agree. I was particlarly impressed by the piece that started the second half. A bit of internet checking found that it was part of Iona Elegy by Phil Cunningham & John Ashton Thomas.
The best singing - Julie Fowlis
The most ridiculous moment - The entire BBC concert orchestra playing stop-time funk chords behind the uillean pipes
The thing that I thought I would ever hear - Lovely Molly sung at a slower pace than ever Jeannie Robertson at her slowest could manage.