Can anybody throw in a spanner or other misleading implement in here.... And why not?

Being from Lothian when at least one bit of it was WEST, I wonder why a Yew Tree has anything to do Lothian skies (or fallopian skies for that matter). I don't recall any yew trees around our way, and way back before that a bit, aren't yews traditionally associated with the english longbow? In which case the only connection with any bit of Scottish sky should be the darkening of said skies with the feared and dreaded arrow-storm.... Those English tourists on their package holidays back with Edward the 1 have a lot to answer for.

As you'll gather, I don't know the song at all, but am willing to criticise on the grounds that I don't know the song at all... but then I am a folkie so that's quite natural.

PS, back at the coalface, we even hear the old "I Like to Rise" at our local session Down Under, although many of the participants wouldn't know a laylan/laylun/laylum/leyland/ley-line/lay-down/lay-about from a mangle-wurzle.