This week's On Your Farm visits North Uist in the Outer Hebrides, a harsh farming environment softened only by the presence of the machair, the sandy coastal plain running along its western edge. Farmed today using methods that would, in some ways, be familiar to crofters of the past, the machair has become a globally-important and precious habitat for a wide variety of plant and insect life. Moira Hickey visits the crofters of North Uist to find out how they marry traditional farming methods with the ever-present need to make a living from the machair.