I appreciate the replies, I was told but don't have a timetable in hand, that I can take a bus from the city centre. Perhaps it would be a long wait for a bus back at this time of the year. As several people mentioned, there might well be snow. I am hoping not too bad, as my dates coincide with rail service being disrupted last winter. If it is too bitterly cold it might be a day for the tall stool. However, I was heartened to hear that a gentleman who does walking tours of Inverness runs the tours year round so I was pleased at that.