"Do Orbital have anything to do with The Orb? I believe The Orb evolved from a group called Another Green World, with whom I played with at Glastonbury back in 1985 (??)"

Nope. The names sound similar but they're separate bands.
Don't know of a relationship between Orb and Another Green World? They're still going anyhoo:

http://www.myspace.com/anothergreenplanet