I can't vouch for 'Penguin Eggs' as I haven't got it, just an entry in my database which refers to the album notes as above - so naturally I assumed the song was on it!
Marian, where do you live? If you're desperate you could send me a tape and I'd copy the McCalmans version for you. They've twinned it with another song, however, making what the late Hamish Imlach used to call a diddly - as opposed to a medley ...