Hello ZanT,
My much-loved grandparents were William & Ann McLean (nee Houston) and they lived in Campbeltown until they died. Billum (William) owned the Southern Sun fishing trawler there, and Ann was a great wit, and very industrious. They had 2 daughters, both still living in Campbeltown and in good health.
Several years ago I went to Peterhead, specifically to view the house the McLeans were raised in - it was tiny!!
If you want any specific info about them, let me know (I lived in Campbeltown until I got married).
Best wishes
A