After a few false starts, mostly because I hadn't a clue what I wanted to do with the trailer, I've got something I'm happy with*.
Thanks everyone who's said how much they're looking forward to the book. The paperback is out in April, but it's available right now on Kindle in the UK or in America, and should be up soon for Nook and other e-readers. It's already had a few lovely reviews, and I've been simply amazed at the number of people who've already Tweeted and emailed to say they've enjoyed it. You guys rock!
*NB: this is pretty much how I write books.