Went in to Oban on Friday 3 June. No problems. Everyone very pleasant. I don't recall radio calls being specified. It was busier than Inverness. Would you object to making routine radio calls there?
I was at Oban on the 2nd June for the first time, I found it to be the friendliest airfield i've ever been to. Simple radio calls, friendly staff - i'll be back when the weather improves! (east coast of scotland sitting in glorious sunshine and the west coast covered with low cloud),