Mix the couscous and salt in a bowl. Pour boiling water over the couscous, cover and leave to absorb for approx. 5 mins. Separate with a fork.
Heat the oil in a non-stick frying pan, fry the peaches for approx. 3 mins. on each side. Whisk together the balsamic and oil in a bowl, season. Mix the feta, rocket and couscous with the dressing, plate up with the peaches.