Well I went to delete some comment spam from my post about the Crimson Room and instead Movable Type decided to delete my post instead. Luckily the file was still there on the drive and after a bit of database hacking I've got the post back, where it should be. Couldn't be bothered to hand put in all the comments though, so I've just copied them as a block out of the saved file.
I have a feeling that there are other posts to which this has occured to, and I shall endeavour to find these and replace them also.