Just popped on to the Waterstones site to pre-order Bill Bryson's new book The Body - A Guide for Occupants (due out 3rd October, if you're interested), as I like to support them as much as possible, even though they haven't invited me for a signing since the last king died. There's a very generous offer on the book price: reduced from £25 to £12.50 - bargain! Anyways, I was heading for the 'Payments' page, when I spotted this:

Now, I kinda know what they mean, but really..?