[stimpee]

So thats your answer is it? go and listen to some dinosaur remains. read the wiki. no thanks. the idea is for you to present the evidence here not for us to find out for ourselves. i'd rather drink paint than listen to anything containing Rick Wakeman.

I can see elements of The Orb in Pink Floyd, not just in the music but in the artwork (the Battersea Powerstation reference is obvious) but not with Orbital or Underworld.

"One of These Days...." and "Sheep" by Pink Floyd
Close to The Edge and Fragile by Yes
virtually anything by King Crimson
virtually anything by Emerson Lake and Palmer
virtually anything by early Tangerine Dream.

Certainly Tangerine Dream are much more ambient and electronic than progressive rock and King Crimson have the psychedelic element with Robert Fripp going off at a tangent at various times, whereas I see Underworld as much more sequenced and repeated than anarchic guitar/keyboard solos. but just name dropping these doesnt say anything more, though i suspect if i keep prodding you with a sharp stick you might answer properly and not just in big letters.