Posted: 12/10/2015 at 06:13
That's what I'd do Fidget - I'd dig over the allotment again, getting out what weed roots etc that I can. Then in the spring I'd treat any re-growth with Roundup.
Remember to leave the weeds long enough for the Roundup to take effect. They need to be brown and dead before you pull them up otherwise the glyphosate won't have got into the roots and any little bit left behind will regrow.