http://www.whsmith.co.uk/
W.H. Smith have shut down their website entirely, after some questionable content (they don't say, but probably some crazy niche erotica) got onto their web shop via the kobo self-publishing feed.
Their response: Their site is currently closed, and they have instead a statement (Reproduced below the fold for posterity).
They are removing ALL self-published e-books from their website. ALL of them. Not just the ones they get published via Kobo.
In scale this is like B&N closing their website, W.H. Smith is HUGE in the UK. It must be costing them millions of pounds per day to do this, and the site's been down a couple of days already apparently.
My guess what happened: self-pub erotica authors mis-categorizing their product, in order to get around the fact that stores like W.H. Smith filter the incoming e-book feeds to remove and/or wall off the erotica - there's a lot of speculation this is also behind the currently ongoing 'zon crackdown on adult content. And by doing this, they have pretty much stabbed all self-published authors in the neck. Good going guys.
Statement below (ETA, title was unclear, shelves on the e-book store, not physical, this is only about e-books so far)