OK, so Mills and Boon aren't actually magazine publishers, but I think it's fair to describe their stories as being aimed largely at women - and this competition is being run by a womag publisher. Will you let me off?
To enter you need to send your novel's outline and first chapter by the end of March. There's lots of advice about what they're looking for on the website. The winner will get £500, publication of their book, a session with an editor, books and publicity.
(If you're interested in other writing competitions, see this blog. Details of new, free to enter writing competitions are posted every few days.)
Does signing the wedding registration certificate count as romantic writing?