Ive managed to whistle the chorus of it here

http://members.tpg.com.au/~jimmy_f/tune.wav

Some of the lyrics are ( i think)

"....dont be late"
"You'll/I'll be on my way"
"Im certain..."
and perhaps "My troubles..and worries..they're gone"

Any help would be great as ive been trying to track this one down for a while.

Regards,

James