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Can someone tell me what this is and what it eats please, we are keeping him in a tank in the house.
This could well be bright-line brown-eye. If this is right you have a good number of options as they are not fussy eaters and their food plants include docks, goose-foots, nettles, hazel, hop and if your tomato plants aren't producing well, you could try them as the caterpillar can be quite a pest on tomatoes.
Lat/Lng: 57.183438333333, -2.199265
OS grid ref: NJ880103