I'm finding it increasingly difficult to get a picture of the Yahoo ads (or any escalator ad for the that matter) even though our escalators hardly travel at any speed they seem to be just fast enough to get very blurry shots. Perhaps I just ought to use my flash and pretend I'm a tourist who can't understand the "DO NOT USE FLASH PHOTOGRAPHY ON ANY PART OF THE LONDON UNDERGROUND" announcements. Or simply be a smartarse and say "It's not flash photography, it's just pretty basic, it's very flattering for you to say it's flash, blah, blah" and hope they see the funny side.
Anyway - here's blurred version of the Yahoo Ad which points down for Sardines, you'll also see ones pointing down for Claustrophics and ones pointing up for Daylight.
More will follow when I find a broken escalator without a trail of people behind me.