Hi Alistair,
Nice to see you on this forum too. I am a bit of a "T16 afficionado" and if you do some searching you will see a lot of information on T16's amassed over the years. To get you going, here are a few threads:
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Wartime T16 pictures
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Carrier, 4.2 inch Mortar (T16)
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Picture ID challenge: T16's near Caen
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A Brief History of the T-16 Carrier
Hope this helps,
regards,
Hanno