Stuck on the bottom half. These might help me get going again:
28a List characters sure to be fascinated (10) ??????????
29a Daisy's outside with Bill - they're a couple (4) ???D
16d Horseman's heading off before horse trial (9) N?G??????
17d Drug wrapped in brightly coloured newspaper is something for a key player (4,5) R?E? / O????