Charles Stross has, on his blog, announced that his Laundry Files novels have been optioned:
THE LAUNDRY FILES has been optioned for TV by 42 (producers of Watership Down and Traitors (among other things). This has been grinding through the works for over a year. It's an option deal, meaning the production company are looking at writing a pitch and maybe a pilot script and seeing if they can get a network interested, so it's early days. It doesn't mean that a series has been commissioned or that anything is going to happen. (We've been here before, circa 2006-08, with an American outfit, and in the end nothing came of it.) However: it's a British production company, so anything that emerges this time round is likely to have a British feel to it, and they have a great track record.