Across:
:1. Argument between British leader and colonials essentially: which 6 made a form of 12 15 across 24 in 1826? (5)
4. Improvise some music with other-wordly visitor using special response unit, known for 30 24s deployed from 1776 (5 4)
9. With energy, breaking limbs, ICE are rampaging idiots! (9)
:10. Something we'd iron out, from mediating sides of mystery: which 6 made a form of 12 15 across 24 in 1826? (5)
11. Burden confuses cycling (6)
12. Hiding in inn later, drunk (8)
15. Search America before moving into where fuel is consumed (10)
16. see 3 down
19. Cane - nasty thing a youngster doesn't like getting (4)
20. Protocols with branched structures to accommodate memory with ten power cores (10)
22. Fail to control this, sliding around, as 28 may do in a car (8)
24. Many people contributed to such device in turn, through benign efforts (6)
27. Perhaps where you saw a cowboy and what he did with love (5)
28. Without caring lead, schooling a failure for these rogues? (9)
29. Swapping Charles the First for Second, once Charles the Third's partner becomes provider in a measured way (9)
30. It may be let off running amok with silly mates? (5)
Down:
1. Nonsense about balm for skin sores (5)
2. They investigate unusually dumb omens (9)
3,16ac. In 1876 he developed a 26 21 24, a novel coin (pound, gold), and a rice dish with half of the rice missing! (8 4)
4. Hurriedly write about large shock (4)
5. Gives the wrong idea to military intelligence, wrong for manuscript (10)
6. Working mule as vehicle for change in books 9 and 10 (6)
7. One gets tied up before butchering in a porn horror (5)
8. Attempt to extract love from conservative?! (3)
13. Shapes formed turning around reel? (5)
14. Stores stocking heads of rare four inch echinoderms (10)
15. Husks and tea with fellows (5)
17. Fire rite meant to change (9)
18. Scores disappeared in matches (8)
21. Alright to interrupt organised rest for medical episode (6)
23. Arachnids lacking P.R. teams (5)
25. Some disturbance around quiet English town (5)
26. IV for taking drugs essentially (4)
27. Lifting door has one less round part; push one as part of 24? (3)
Solution:
BROWN=JAMESWATT|
O=M=I=O=I=A=P=R|
IMBECILES=MOREY|
L=U=O=T=I=U=O==|
SADDLE=INTERNAL|
==S=A=S=F=L===O|
COMBUSTION=OTTO|
H=E=S=A=R=T=E=P|
ACNE=FRAMEWORKS|
F===S=F=S=E=M==|
FISHTAIL=ENGINE|
==I=R=S=F=T=N=P|
RODEO=HOOLIGANS|
O=E=K=E=U=E=T=O|
DISPENSER=STEAM|
Name: 903 - Benign Efforts
Author: by BenDR

Annos-Across:
:1. B(ritish) + ROW  + (colo)N(ials)
4. JAM + E( SWAT )T
9. E in *( LIMBS ICE )
:10. ORE in M(inorit)Y
11. cyc( ADDLES )
12. *( INN LATER )
15. COMB + US + *INTO
19. *CANE
20. F( RAM + (t)E(n) (po)W(er) )ORKS
22. *THIS in FAIL
24. rev tel (b)ENIGN E(fforts) <
27. RODE + O
28. *( S(c)HOOLING A )
29. DI SPEN( c -> S )ER
30. *MATES
Annos-Down:
1. OIL in BS
2. *( DUMB OMENS )
3,16ac. *COIN + L , AU + (ri)SOTTO
4. JO(L)T
5. MI + SIN + FOR + MS
6. *( MULE AS )
7. A + *PORN
8. T(o)RY
13. rev( SPOOL ) , ext def
14. R F I in STASHES
15. CHA + FF
17. *( RITE MEANT )
18. T(WENT)IES
21. OK in *REST
23. S(p)IDE(r)S
25. P in *SOME
26. U in FOR
27. rev( DO(o)R )
Defs-Across:
:1. which 6 made a form of 12 15 across 24 in 1826?
4. known for 30 24s deployed from 1776
9. idiots
:10. which 6 made a form of 12 15 across 24 in 1826?
11. Burden
12. Hiding
15. where fuel is consumed
19. thing a youngster doesn't like getting
20. Protocols
22. as 28 may do in a car
24. Many people contributed to such device
27. Perhaps where you saw a cowboy
28. rogues
29. provider in a measured way
30. It may be let off running amok
Defs-Down:
1. skin sores
2. They investigate
3,16ac. In 1876 he developed a 26 21 24
4. shock
5. Gives the wrong idea to
6. vehicle for change in books 9 and 10
7. One gets tied up before butchering
8. Attempt
13. Shapes formed turning
14. echinoderms
15. Husks
17. Fire
18. Scores
21. medical episode
23. teams
25. English town
26. IV
27. push one as part of 24