Overgrown clumps of herbaceous perennials can be divided now. This will invigorate them and improve flowering and overall shape. Lift the clump and split the outer area of the clump, discarding the centre which will be the oldest part of the clump.
Don’t worry if you are not able to do this now, some can wait until next Spring, just make a note of which ones need attention.
Continue to deadhead plants to prolong the display. Why not treat yourself to some Spring bulbs that you can scatter around the garden or put into pots to give some brightness at the beginning of next year.
Net ponds before the leaves start to fall. Lift the height on the mower and mow less frequently now. An autumn lawn feed can be applied now which will harden up your lawn. This is best done after the lawn has been scarified and aerated.
If you want to lay a new lawn or reseed an area, this is a good time of year to do this. Cut or strim summer flowering meadows now after the have gone to seed.
As you carry on harvesting your crop of vegetables from this year, you can get ahead by sowing some crops for next year. Some broad beans and peas can be sown now for an earlier crop next year, along with spring cabbages and spinach (this might need to be covered from frosts). Onions and garlic can also be planted now for harvesting next year.