The script called for a tree: a magical kind that looked like no tree on Earth. It would need to look like it had been standing for thousands of years. It would need to be in a wood full of dark twisty branches and dense canopies. It would need to seem like the place that a hardened nobleman might escape to for a moment of quiet. And Robert Boake knew just the one. Boake had been working as a location scout in Northern Ireland for a few years, when in 2008 a producer sent him the script for the pilot...