-- For the intro, if you sit on an Em chord on the 7th fret (X79987), you can find your way around the main melody line of the keyboard that Eddie Rayner is playing. (The guitar part at that point is just doing that damped string/percussive thing, so when playing it alone on an acoustic, it helps to play around on the Em.)
-- The psychedelic instrumental break is composed entirely on C#m (a last-minute idea from Nick Seymour that saved this song from being scrapped.) All the fun stuff is going on in the keyboards, while the guitar just sits on that one chord. I would suggest creating a guitar solo for this section (which is what Neil does when it's performed live).
INTRO: Keyboard doodling around Em
There's a hole in the river where my auntie lies
Left her car by the river left her shoes beside
Through the thorns and the bushes I hope she was ...
Dreaming of glory
Miles above the mountains and plains
Free at last
We were touched by a cold wind, my father and I The sound of desperate breathing her fear inside us all She was coming to see him but something changed her mind Drove her down to the river There is no return