I think this song is too new for there to be much information about it on the Internet.

In fact, I had never heard of the Transatlantic Sessions until you asked. They haven't been shown over here, and the albums aren't available except as imports. (Americans: see
RTE or BBC Scotland). Thanks for bringing this to my attention!

Here's my attempt at a transcription:

THE OPEN DOOR

Well, it's fare thee well, my true love. A song is in the air.
I hear the west a-callin' to see what's for me there.
With the sun I'm leavin'. I'll be Montana bound.
Ain't no use in grievin'. I'll show you what I've found,
Show you what I've found.

Some folks have it easy. At least that's how it seems.
Reach up and pick an apple, reach up and find a dream.
Some travel in the darkness and rest upon the shade.
Some wrestle with their demons and face them unafraid.

We argue for our better selves. We only ask for more.
We take the mirror from the shelf and find the open door,
Find the open door.

I love you with a fever. I love you with the past.
My heart is a keeper as long as it will last.
As long as it will last, I'll tell you what I know.
We walk this road together and we walk this road alone.