jono @20: I suspected some kind of perimeter Nina from Kite last week because of the many F, T and S entries.
But after brief thought I gave up, and would never have guessed the DARTBOARD theme.
After being ill last weekend, I have little crossword time this weekend (nice sunny weather, etc). Didn't much enjoy this Prize. Struck out on 25 and 27, don't want to spend any more time on them. After reading the hints, I now have 2 candidates for 25, but drawing a blank on 27. Giving up, will check 225 reveal next week.