Empty the salad bags into a large bowl.
Peel the oranges over a small bowl to
catch the juices; then, over the same
bowl, cut the segments from the pith.
Whisk the walnut oil into the orange juice,
season, and pour over the salad leaves.
Toss the salad, then arrange on a large
platter. Scatter over the orange
segments, walnuts and Stilton.