Another advert, another controversy, it seems. Just a couple of weeks ago a Grand Theft Auto IV ad was removed from Streatham because its gun-toting avatar was deemed insensitive in an area that had recently seen two gun-related murders. Now an ad in Crystal Palace train station for Chris Ryan's new book, Strike Back, will also be taken down because of its pro-violence message. With a recent spate of stabbings making headlines, it's no surprise......