Across:
   1. Produce switch? (4)
   4. Racers hug crook for an additional fee (9)
  10. Underground musical piece, first of tributes for 11 27 (11)
  11. Important right: getting out of jail (3)
  12. Borders on disorder to kiss trout (9)
  13. Loose-limbed drunk fellow (5)
  14. In nest, a kestrel placed lengths of wood (6)
  15,24dn. May run for the roses, treating turkey neck by using tail of bud (8 5)
  19. Small ply covering butt thinly (8)
  21. Leviathan author mostly embracing left's restraint (6)
  24. Some get a cuddle on return ... treasure! (5)
  26. Lash mare, struggling ahead of fourth of geldings American pushed into group (9)
  27. Socialist friends? Not odd at all! (3)
  28. Fifteen shillings perhaps as won by 10 in 1973? (6 5)
  29. Intriguing early sign for future track champions perhaps (9)
  30. Dishes up some pasta easily (4)
Down:
   2. Product from milk of goat to circulate around (7)
   3. 14 requiring peak fitness to take front of run without spasm (9)
   4. If you can't do these, maybe you need a lift! (6)
   5. Reins intially nearly dropped, and used awkwardly when available again (8)
   6. Loathe travelling without a place to stay (5)
   7. Colt in top of bracket one racking firsts up like a machine (7)
   8. Bird with energy? 13 one missing! (5)
   9. Calls for end for bridge partners (8)
  16. Ooh! The cat went berserk - a canine issue perhaps? (9)
  17. Spineless, sad, dingy lie (8)
  18. Palimony arranged for Aphrodite perhaps? (8)
  20. Pastoral bliss turning up, waylaid: a craggy part of Greece (7)
  22. Smitten men bolt and run for the carnations in these 14 (7)
  23. They work with bits slid back around both sides (6)
  24. see 15 across
  25. Some, they say, working at lot (5)