Across:
   1. As people achieve them, cosmic plans change (15)
   9. Badly laid up? Time for some acknowledgement of your 1 across (7)
  10. Try 11, swallowing dry measure  (7)
  11. An exercise guide is suitable (3)
  12. Those inside it ban hints - a problem! (11)
  13. Dialogue and directions split about Canadian north (10)
  15. Group from club fall to tragic ends (4)
  18. St Peter's top notes about eastern chant (4)
  20. Silly old battleaxe about to get boot (10)
  23. Balls police disrupted having potential to fold (11)
  25. Vessel not described favourably but returns intact (3)
  26. Support an energy code: E944 (7)
  27. I object to a certain strategy (7)
  28. On bottom, Chicago trains with lean surface legend (15)
Down:
   1. Got up after program rated (9)
   2. Grant (the councilor) nursed broken heart  (7)
   3. I've some medical assistance (8)
   4. Seize Lutheran leader attending church (5)
   5. The right high profile directors (9)
   6. Quiet eating at change (6)
   7. Declared return of network I'm on (7)
   8. Places it among directions (5)
  14. Port sells off those that ask question (9)
  16. Accountant to tease Atkinson character out of Kingston perhaps (9)
  17. Dismal traces of prophesy (8)
  19. Film at 2pm in Australia (7)
  21. Courage to be going back in with whatever's at hand (7)
  22. Wear and tear due to mother's advancing years (6)
  23. Leave north, prance about as 24 might (5)
  24. Storied future prince to disturb ambivalent region (5)