Hiya - I originally wrote the theme tune for the children's tv series back in about 1986, along with the songs and incidental music. The original vocal was recorded by the series author, John Grace, but I recently re-recorded a version of the theme for RU-vid with more complete song lyric. Hope you'll take a look:
I love DADGAD tuning - experimented with it a while back and my guitar playing got so much more precise from playing little melodies on the high strings. My guitar is almost always in DADGAD :)