One of my favorite scripts of all time is Sexy Beast, written by Louis Mellis and David Scinto. The dialogue is so good that you assume it must've been largely improvised, but i've heard Kingsley/Winston say in interviews that it was straight off the page. Truly amazing and unique IMHO. Don Logan is for me without doubt the greatest villain ever committed to film.
Before that they did the excellent Gangster No1, which at the time created a little talk of it's star Paul Bettany being a potential Bond.
Since Beast they wrote 44 Inch Chest, which was a little underwhelming in comparison to Beast, but still a strong script in comparison to everything else.
Since then there's just been a short film and a crime drama in development which is a real shame. I think 44 Inch Chest probably set them back a little as everyone expected a new Sexy Beast. But i think their problem is that their working in the same genre and finding themselves aping their own masterpiece. Moving into slightly different cinematic territory could be the shot in the arm they need as writers, who are obviously incredibly talented. I'd take the risk of letting them loose on Bond.