2155: Poor Billy’s left out

The unclued lights (two must be paired) are of a kind, verifiable in Brewer.
 

Across

10   Details from Britain forged (4)
12   Colour of monster coming to grips with awfully vile demise, almost (10, two words)
14   Mother isn’t me or her, we’re told (3)
15   Offering a sleep before dance (8)
17   Trousers covering pants (5)
18   On the throne, expecting to be beheaded (7)
19   Quiet Lett disturbed Jewish community in Eastern Europe (6)
22   False tears affected Zulu (6)
24   Country is popular returning help (5)
26   Support from Labour leader on committee (9)
29   The French greeting and farewell (5)
31   Scots hungry for source of the ‘black drink’ (6)
36   Centre-spread a little earthy for comic poet (7)
38   Brings in the food for Yuletide singers (5)
39   Unobservant Monseigneur troubled losing ROM (8)
40   Bird cage (3)
42   Rune casework (4)
43   Skewed quality of young lad having bounded round headland (12)
 

Down

 2   Bucked up with or without wrecked canoe (10)
 3   Obviously not a top hat for slow progress? (7, two words)
 4   Cut in swamp (5)
 5   Turning into Ripon for wine (9, two words)
 6   Catmint — ditto — above letter (6)
 7   Pierpoint’s regular supports (5)
 9   Certainly not rock’s quality — or is it? (12)
11   Outlook of Caesar’s translucent spot (8)
13   Peevish boxer embracing, say, links with crimes (12)
16   Rasta, amateur performer, starts rhythmic monologue (3)
19   Records under small bone (6)
21   No cabin-boy (10, two words)
23   Committed Tory added his moniker (9)
25   Royal wife from her former province (8)
30   Problems with tools (6)
32   Vessel in posh navy (3)
33   Sauce made by combining some grapes and tomatoes (5)
35   A tailless bird pulled up seaweed (5)
 
A first prize of £30 for the first correct solution opened on 14 April. There are two runners-up prizes of £20. (UK solvers can choose to receive the latest edition of the Chambers Dictionary instead of cash— ring the word ‘Dictionary’.)