Plants under glass such as the ones in the greenhouse need protection from the upcoming freezes.
If you want to prepare new borders in your garden, this time is the ideal time to do so.
When your tomato plants have been affected by blight you should remove and burn them. Do not put them on the compost.
Why not go around the garden and collect the various seeds that grow there?
Use nets to cover up ponds, this will prevent leaves and other things from polluting the water.
Try to keep fallen fruit off of your lawn, rotting fruits encourage pests and diseases.
Keep marrows, pumpkins and squashes off the ground by elevating them, this will prevent snail damage.
Continue to water and deadhead hanging baskets but stop feeding them.
Clean and sharpen the various gardening tools that lye around in your garden.