Still can't understand why the Telegraph crossword site will tell you if you've got all the right answers when it's a prize crossword. It even tells you which clue(s) you've got wrong.
I think it is possible that one cannot enter the competitions on Saturday, Sunday and Monday unless one buys the paper. There is certainly no addresses on the clued-up pages to which to send entries, which there used to be.
I have asked the question but have not, perhaps unsurprisingly, received a reply.
Even so catron it gives one ad advantage, you could do the crossword online and then fill in the blanks in the paper and send off for the prize. But I suppose the same is available to anyone with a PC.