Have completed puzzle, but cannot parse 22d: Ex-PM has changed sides, is sent flying (5) B-O-N. Presumably Brown, but why? Also, this could not be part of the theme as it's a defined clue. I have themed solutions at Across 11; 22; 24 and Down 1; 2; 3; and 6. For those who've done the puzzle, this is 7, but where is the eighth? Thanks in advance.