Across:
  1,4. Super cad raced about identifying 13 (5,8)
  10. 10 shine 10 pieces over 19 (11)
  11. Snatch back, rub out (3)
  12. Men In Black, perhaps, run Rome's affairs (8)
  13. Someone like Tendulkar loses heart for 21 (6)
  15. Elton twins wander in Californian setting (10)
  16. Comic company came around (4)
  19. see 24
  21. 1 across 4 reported peace at G8 (4,6)
  24,19. Obtained food near population centre protected by 13 (6,4)
  25. Drink in the power of the sun! (8)
  27,2 dn. Once turned in, Pete hung as a scourge of 24 (3,7)
  28. Soils with traditional water supply allow movement at grass roots (11)
  29. Original style "Sir" like none we've heard! (8)
  30. Essentially, heresy no drama for such a gathering (5)
Down:
   1. 199 sorround deranged inmate released from 15 perhaps (9)
   2. see 27 ac.
   3. Standoff arrangements need test deal (8)
   5. Legal documents issued to audience at upmarket venue (4)
   6. Strut, say, about remains (6)
   7. When describing (21) 13 and 8 as Fibonnacci, many deem it a bit retro (7)
   8. Steal from fashionable bird, reportedly rockin' (5)
   9. Scheme to bolt heart? (9)
  14. A new King, a new beginning (9)
  17. Caught 23 in spoken Finnish (9)
  18. How to find out what happened in quintessentially disastrous first half (8)
  20. "Pieces of Eight" at terse passage  (7)
  22. African, but much closer to Australia when new (7)
  23. Drink with the French in mess (6)
  24. Men In Black, perhaps, secured High School (5)
  26. Cost of returning incomplete ballots (4)