LadyBrynamman,
So you are from Roy Noble country.
If you are talking about the SWEPost,I always post mine on a Monday or Tuesday.
As the closing date is Thursday you can't leave it for posting on Wednesday as you cannot rely on the Royal Mail delivering next day even with a first class stamp.
My family post 4 off every week and we win occasionally - not that a £10 voucher changes your life!!!
Have you noticed that each week there is a spread of winners across the paper's catchment area. Not that I'm suggesting for one minute that they are not picked at random out of the sack!!!
P.S. If yours arrives on the Monday - it is at the bottom of the sack!!!!! (Just a thought.)