Twelve miles off the coast of Tiree, the sea does not so much break against Skerryvore as lean on it. The tower is 48 metres of granite, built in 1844 by Alan Stevenson, and for a hundred and fifty years three men lived inside it at a time, keeping a flame alive through every night of the year.
The last keepers left in 1994, when the light went automatic. But automatic is not the same as unattended. Somebody still has to come out on the relief boat, climb the 151 steps, and listen to the machine the way the old keepers listened to the weather.
That somebody, for the last nine years, has been Donald Morrison.