Intro is a C chord. It’s just a C scale, starting on G.

C
Walter, remember when the world was young
                      Eb         Bb
And all the girls knew Walter's name?
F                     F7                              Bb
Walter, isn't it a shame the way our little world has changed?
   Ebmaj7                                       D               G
Do you remember, Walter, playing cricket in the thunder and the rain?
   Bb            Cm              Dsus         D7               G
Do you remember, Walter, smoking cigarettes behind your garden gate?
     Ab           Eb
Yes, Walter was my mate,
    G                F                     C
But Walter, my old friend, where are you now?

cool drum fill over bouncing C chord...
melody plays over C chord, then ...

Eb        Bb
Walter's name
F                  F7                                 Bb
Walter, isn't it a shame the way our little world has changed?
   Ebmaj7                                           D                G
Do you remember, Walter, how we said we'd fight the world so we'd be free.
     Bb              Cm             Dsus           D7           G
We'd save up all our money and we'd buy a boat and sail away to sea.
     Ab           Eb
But it was not to be.
  G                 F              C
I knew you then but do I know you now?
C                                                    Eb     Bb
Walter, you are just an echo of the world we knew so long ago
F             F7                            Bb
If you saw me now you wouldn't even know my name.
  Ebmaj7
I bet you're fat and married and
                      D                G
you're always home in bed by half-past eight.
         Bb               Cm
And if I talked about the old times
          Dsus                  D7              G
you'd get bored and you'll have nothing left to say.
     Ab           Eb          G           F              C
Yes people often change, but memories of people can remain.