The unclued lights are all 10 38, which is suggested by the title of the puzzle.
Across
1 Puts together conferences wherein Spain takes the lead (5)
5 March man usually sick in space (7)
10 see preamble
12 Type of weather check for listeners (4)
13 Latex worker with troubled air (6)
14 Communist proposal includes roubles for US flyer (7)
16 Competes with trio in folksong (6)
17 King and prince provided ruler for Muslims (6)
18 Topless dames receive first of several warnings (5)
22 Chances to instruct heads when venerable one's around (7)
26 I struggled with clinging coat (5)
28 Flight organisers left out material for kite (6)
30 Jittery batsman hopes not to get the ball here (6, 2 words)
31 Understood result of knife in abdomen? (7)
34 In state of confusion abstainer departs, stoned (6)
35 The ear's missing quiet contribution to obscure topic (4)
37 Take in travellers' jargon, we're told (7)
38 see preamble
Down
2 Heartlessly exclude ducks (4)
4 Sluggard keen to keep hold of pound (4)
5 Insistence on correctness acceptable in Cecily's governess (6)
6 Erred in speech greeting Pakistani (6)
7 Robes for peasants? Not right! (6)
9 Active couple embracing quartet inclined towards love (7)
15 Earth vessel's leader finds alien creature (4)
19 Cow's production of milk one short of the limit when drunk (7)
21 He may form part of Shanghai delegation (4)
24 Find fault with FT (6)
25 Gloomy American has running sore - doctor called in (6)
27 Love fresh original fabric (6)
29 Are conservationists found inside cavern? (5)
32 Vehicle lifting a rock (4)
33 Celebrated singer changes note in downward swoop (4)
To enter the competition send your solution , in list format, to me at derek@crosswordcentre.fsnet.co.uk before the 1st December 2006. The first correct entry picked will win a copy of Chambers The Independent Book of Weekend Crosswords which has been donated by the publishers.