As the evenings draw in and temperatures fall, now is the time to think of - manure!
To give next year's vegetables the best possible start in life, order a load of composted manure. Then, once you have cleared the vegetable bed and the soil temperature has fallen to winter levels (probably in November or so - depends on the weather of course) spread a layer of about 6 inches thickness all over the bed and just leave it over the winter. The manure will slowly settle in to the soil, so that, when it is workable again in spring, you can easily dig it in and then plant your vegetables.
It is important to wait until the temperatures have dropped though, otherwise the nutrients will leach away before they have a chance to get absorbed by the soil.
Apart from the nutrient value of organic matter like manure, it also acts as a mulch and holds down the weeds - at least for a while. But weeding the vegetable patch is a task that will never fully go away!