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Longdan vietnamese shops stock dehydrated soy chunks/curls.
Any shops stocking Indian cooking ingredients will have TAS brand soy chunks too, they're good and cheap.
Yeah, I'm familiar with these (also, the only real veg "meats" I had access to when I first became veg long, long, ago). But those Polish ones look to be cutlet size, according to my google search, which is different from what you're describing I think?
What a pro-tip! I didn't know these existed!
Anyone know of a sklep in Hackney centralish that has them?