Paul Cornell confirmed on his blog that Captain Britain and MI-13 has been cancelled.

Cornell went on to say "As you may have noticed, there’s no solicitation today for #16 of Captain Britain and MI-13. That, unfortunately, is because #15 is the last issue. A lot of books end without a word from their creative teams, but, with Marvel’s blessing, I didn’t want that to be the case this time. There are, I think, a few things worth saying at this point.

Firstly, and most importantly, I wanted to say a huge thank you to our loyal and enthusiastic fans. People like Mark Roberts (known as The Sword is Drawn), Dave Wallace, John Mosby, the guys at I,Fanboy, and all those others who’ve been so vocal for us on the internet, who have created and run banners in support of the book, and those who just bought the book and enjoyed it... you lot rock."

Read more here.