Loch Laggan
This huge lake turned out to be Loch Laggan, the scene of the British TV series, "Monarch of the Glen" - a show I never heard of but which the people on our EF trip in 2006 constantly went on about. Now that I looked it up on Wikipedia I see that the gatehouse I stopped at is called "Ardverikie House" and is also featured on that highbrow TV show that I have no interest in.