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I think the cut off is march for charities to assign places and they wouldn't risk you doing anything dodgy for fear of getting busted by vlm and not getting spots next year as it's a pretty big earner for a lot of charities, your only hope is to either find someone who hmisnoullingnout late due to injury or just joining the run and hoping no one spots you have no number. I bleieve @kl is an expert at doing this!
Probably worth getting your leg checked out, as those symptoms could be from deep vein thrombosis (especially if you were dehydrated).