Autumn is a good time to feed your lawn especially after rain.
Use an organic lawn food or a controlled release lawn fertiliser.
Autumn is a good time to sow bare patches in your lawn. Lightly cultivate the soil and spread some good soil over the patch then sow the lawn seed. Keep just moist.
Autumn is a good time to lay a new lawn. Prepare the soil first with turf underlay and don't forget to include 'Rain Saver' water crystals. Specify weed free soil and weed free turf from well- respected suppliers.