I found this site:

Michael Eskin's ABC music converter

It converts the ABC to tune notation and it can be played as a MIDI file. When I looked at the notation and listened to the audio it did not look or sound like the old Scottish song "The Campbells Are Coming".

Also when I searched for "The Camels Are Coming" there seemed to be a few songs with that name. This Australian Folk Music site shows some music notation and information but the tune notation is different to the notation shown on the ABC Converter site.

Anglogeezer, it would help if you could give us the information on the specific song you are searching for, including the lyrics or some of them, and who sang it, how you know about the song, etc. Any other information would be useful to narrow down the search. Thanks.