[rab] If it's Rufus, this must be Kelvins - if it's Enigmatist, I haven't got a chance :o) No-one's got mine yet, and I don't think the "?" helps at all. Like HIJKLMNO, there's no definition involved. As for "Bust down reason", I know this and I wouldn't've got it in a million years. At least, not without some letters.
Boolbar] I thought the same - but wouldn't the clue be in lower case, if that were the case? [MF] I'm still flummoxed by the 'O' clue but have a hunch it's more to do with numbers than letters.