Many of us take over allotments that are covered in weeds and the autumn / winter is a great time to clear it ready for the next growing season. Remember though when you have cleared an area to cover it with a tarp or black plastic, though you can use cardboard if necessary as it will break down in the soil. Do not use carpet because it is a nightmare to remove and it can leech toxins into the soil.
I recorded a special episode of the allotment diary explaining all about weeds, showing you some of the different types and talking about some strategies you can use to keep your allotment low maintenance and to keep on top of the weeds.