The first I heard of it was on the ubuntu-uk mailing list courtesy of
John Levin.
I decided to blog it, somebody submitted it to digg and it hit the front
page for a time. Around 14,000 people actually visited my blog with the
story, and many more (I suspect) would have read the story via the
planets it aggregates to. I'm quite surprised Tesco's hasn't
investigated the extra traffic those two sites have gained!