You know the drill. You've submitted your thesis to the examiners, or your essay or book has gone through final proof stage when ... you discover a book published ten years ago on exactly your topic that for some reason you never came across and have taken no account of.
Resigned to the worst, I trudge over to the library to find the offending, newly discovered volume, and turned with foreboding to the index. Sure enough, lots of ominous entries for "Garter, Order of the." I turn resignedly to the most substantial looking, but wait: Caroline Shenton can't possibly have written TWO articles on Edward III's collection of leopards in the Tower of London? Hooray, it's a book (Heraldry, Pageantry and Social Display in Medieval England, ed. Peter Coss and Maurice Keen), which I read in St Louis in 2005. And yes, it's in my bibliography.
This is not to say I won't yet discover something I should have read. It's inevitable, really. But today, this Friday afternoon, I feel I have definitely dodged a bullet.