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Jazzgirl/Jono.....the puzzle was from book 2 puzzle 62. There's a note in the introduction which points to one (without naming it) as being published on 1st April. The grid had April Fool related words in each corner, so it was clearly puzzle 62...FOOLS ERRAND, IDIOT SAVANT, CRAZY PAVING and SILLY SEASON.

Mystery solved.👍

Whetstone that's great !
Thanks for letting us know 👍

Excellent! Mystery solved

19a. Release a man confined on board
UNPIN
23a. A jolly girl in the fleet
ARMADA
26a. Slattern abandoning work to fish
TROLL
6d. Bring out point by wartime leader
EDUCE
13a. Abandoned employees first to come round and sign on
ENROL
15a. Correct and speaker's relatively serious optical fault
ON THE BEAM
3d. Police ran Henry in for upsetting marine mammal
NARWHAL
I sort of get the parse, but where does the W come from? From police?
19d. A small number - 18?
HANDFUL

Parses for the above please.

26 Trollop, slattern .Take off 'op', abandoning work, and you're left with Troll, fish.

6d educe - bring out
Point(compass) E + Duce (Mussolini)

33a. a Jolly is slang for Royal Marine
A RM + Ada (girl) = Armada - Spanish fleet

19A - PINNING is a chess term whereby a piece can’t move without exposing a more valuable piece

23a. Jolly is RM (Royal Marine)

13a. LORN is abandoned/forsaken

3d. LAW RAN away reversed over H

3d.....So 'Henry' in the clue is the letter H?

Affirm. SI unit of inductance.