OK, I went and ordered the tape from the Corries website - very quick service, I'm impressed. And here are the chords (the Corries play it in Eb, so put capo on 3rd fret and play in C):

He was [C]just a lonely tortoise [F]looking for a [C]home
His tiny feet were blistered with the [D7]miles he'd had to [G7]roam
I [C]found him in a pet shop, on his [F]cheek there was a [C]tear
And painted on his little back was [G7]"twenty pence to clear"

He's a [F]faithful friend, the tortoise, he'll [C]love you till the [G7]end
And [C]you won't need a person with a [G7]tortoise for a [C]friend

Joan