If his birthday is 18.2.1898 as in earlier answer there are several POW records for a Leonard A Martin
One record gives the following
Martin L.
200810 sign. Essex Regiment
Born 18.2.1898 Leytonstone (1899 in one record)
Parents Mr & Mrs Martin, 605 Romford Road, Forestgate, London
If it had been him, i would have thought it might have been mentioned he had been captured.
Cathy
Added a pension ledger and index card for
Leonard Arthur Martin 3000/200810
has NOK Leonard Arthur Martin (Unsure this is correct as cannot see actual image)
Perhaps the definition of 'wounded' didn't include temporary effects of gas exposure.
I asked an AI about delayed effects of gas exposure, and apparently this was a thing. The source linked below includes this statement:
In some cases, after 10 to 25 years after the [mustard gas] exposure, some patients experienced recurrent or persistent corneal ulceration and chronic conjunctivitis and corneal clouding often accompanied this.
https://eyemuseum.ranzco.edu/wp-content/uploads/2019/07/Mustard_gas_use_in_World_War_V1.3.pdf?utm_source=perplexity
I would like to go on record this 'Remembrance Weekend' to extend my deepest gratitude to...
Maddy , Alan Lloyd & Cath' for bringing to light my Mum's dear friend & Boss, Len Martin.
I was really taken aback that he appears to've been captured & interred as a PoW
Am overjoyed that you've filled in some colour to the palette, as such & enlightened me so...
Guys & Gals on this thread - Thank you so much for bringing this brave man to light
Lest We Forget
.