Diary: Pick of the Week - Nitro/Greater London Authority

John Tylee draws comfort from Nitro's poster for the Greater London Authority in the wake of the London bomb attacks:

"The terrible events of 7/7 will be forever etched on my memory. I was on the Piccadilly Line train behind the one that was blown up. I saw the mayhem and consider myself lucky to be alive. The GLA's 'One London' campaign simply and graphically encapsulates my feelings about my home city." The ad was written by Ollie Farringdon and Neil Richardson and art directed by Andy Bird.