Cover with as much compost as you can get your hands on. I used about 4 inches. Weed at least weekly getting as much root as possible each time. It started out taking an hour a week but quickly reduced as weeds became weaker.
I add about 2 inches of manure when it looks to need it that helps keep it down and have put card and woodchip on the paths as it was free and I knew I would have limited time to spend on the plot this summer. Also on my light soil it will help to retain the moisture.
2 years on I have the other half of the plot too and can weed the whole in about an hour a week 
So keep at it regularly and you will soon have a relative weed free plot. Enjoy