This picture, then, is of an advert for the new Chris Ryan novel, which I spotted at an Underground station in central London. Two things about it that make me go hmm:

1. Isn’t that first rule of engagement suspiciously similar to the line in David Mamet’s screenplay for ‘The Untouchables’, wherein Sean Connery’s character says “He pulls a knife, you pull a gun”?

2. Given the current concern about people (especially teenagers) stabbing and killing each other in London, are the references to carrying guns and knives entirely appropriate for tube ads? I mean, I don’t want to sound all newspaper editorial, but…