The seventies are a little too far back for me but I do remember the early eighties. HAC used G-BAUY and G-BFLU for weekend flying lessons there in the late seventies. Other visitors included Scottish Malt Distiller's Aztec and occasional golf charters. I recall the aerodrome became de-licensed in 1982.
Do you remember as far back as '73 when Loganair ran a Trislander on a schedule? The history books say there was a second cross runway there but I could never picture where it ran despite still visiting there to this day.
The strip is still in fantastic condition, helped by the blocking of vehicles attempting to cross it with wooden studs which completely surround the perimeter. Sadly the old 1950s Bedford yellow fire engine departed some years ago and the shed is used for storing wooden partitions for the nearby Dornoch Agricultural Show held in July.