I found this creature encased in this outer shell, the second picture shows what it turned into!
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what plant is it on?
some yponomeutid moths make open mesh cocoons like this, such as the diamond-back moth Plutella xylostella (on cabbage and relatives) and the leek moth Acrolepiopsis assectella (on a wide range of Alliums such as leeks, onion, chives etc.)
Lat/Lng: 52.5919, -3.8527
OS grid ref: SH745009