Whether you like writing long or short stuff, there's always a suitable competition for your work. Here are two from the extremes:
The Bath Novel Award - Send the first 5000 words of your novel plus synopsis, by end February 2014 (so there is loads of time!) Top prize is £1000, and the judge is a literary agent, so there's more to be won if she really likes your work.
If you can't face writing a novel, how about writing a single line? Fleeting Books are running a competition to find a brilliant new rule for writers. Something along the lines of "Write drunk, edit sober" (Hemingway) or "There's a word for a writer who never gives up: Published" (J A Konrath). Send in your own pearls of wisdom by 31st July for a chance to be included in a new book 'No Cheap Tricks', invites to launch dos plus £100 cash.