I've just learned a valueable (albeit painful) lesson - DO NOT republish your blog template before previewing changes that you have made!
I've just managed to corrupt mine with some spurious cutting and pasting, and all I was trying to do was add a link to another blog. Not only that, but I've just added some of it back in and then left the template editing page without saving changes! ;-(
This just shows how befuddled my mind is at the moment due to the horrible cold I have. Please bear with me until normal service is resumed (sniff, cough, where are those tissues..?).