I got Nephilim's Child finished on time and then read the rules to the Daily Mail competition... Double spaced and printed out, delivered by 2nd July during a postal strike.
*If* I can get 700 pages printed, bound and posted by courier I may stand a slight chance of getting it there on time, if I can afford all that.
If you're running a national competition, why ask for manuscript submissions? The chances are that 75% of these won't be read past the first page, so why not ask for either electronic submission or just synopsis and first 10K ?