On Kirkabister Ness, on the southern tip of the Isle of Bressay, Shetland. It was built by Robert Louis Stevenson's father in 1858, and the light is now run automatically.
If you fancy a holiday with a difference, the former lighthouse keeper's cottages are available as self catering accommodation.
@gardencat It is not quite as isolated as you might think Joanne. roughly a three mile walk/cycle /drive North and you are then a ten minute ferry trip directly into the middle of Lerwick, Shetland's capital, and largest and busiest town.