You can't fail to have noticed the phone hacking scandal that's been all over the news the last two weeks.

In fact, it's been in the news for a few years now with the Guardian's Nick Davies first publishing his investigation in 2009. They have stayed with the story ever since despite claims from various parties that it was going nowhere. London Mayor Boris Johnson famously described the story as "codswallop" that "looks like a politically motivated put-up job by the Labour party".

It's a tricky thing to run ads about, partly because it's an incredibly fast moving story and partly because in a world of 24 hour communications, where this story leads the news every night, does it need ads?

To help raise awareness that it's a Guardian story and to encourage readers to stay with the story, we've been running digital escalator panels at 18 sites across London all week. We're updating them twice a day, in the morning they show the main headline and the front page of the newspaper and in the afternoon they're updated with a relevant tweet from Guardian news.

The Guardian's full coverage of the phone hacking story can be found here.