Posted: 20/04/2014 at 22:46
I garden organically too but I have such persistent weeds creeping in or blown in from surounding arable land and pastures I use glyphosate to clear the paths and major infestations each spring. However I deeply disapprove of Monsanto so nver use Roundup. There are other, cheaper glyphosate based weedkillers out there that do the job.
As No Expert says, why not use it on an area to get you started and maybe put down newspaper, cardboard or black polythene on the rest of your allotment so it'll be ready for you to work later on. Then you can work at a sensible pace without being overwhelmed.