most herbs will do nicely in a pot, if you would prefer to use the plot for a few veg?
Not a lot you can plant from seed this time of year, but you can, as others say, usually buy herbs to plant out. In addition to rosemary, bay, chives, thyme, parsley, basil and corriander, I have: Savoury (woody perrenial, great with chicken, in soups or even a few leaves in a salad,) salad burnett (very pretty, fern like leaves, which taste of cucumber), fennel (big and showy, liquoricey-flavour, nice with fish), tarragon (great with chicken), hyssop - great for herbal teas, and butterfly and bee-attracting, sorrell (very tart and citrus, good in soups and salads), lemon balm (sharp lemon scent, attractive leaves and flowers, great in cold drinks or as a tea), peppermint, morrocan mint, borage and lovage. Most of these are in pots.
Next year you could grow - in not much space - a couple of broad beans, runner beans, lettuces, tomatoes, courgette, chard, spinach, spring onions - all pretty easy.