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Marsh carpet and dentated pug moths are found at the reserve. Could it be one of those? I can't find a photo of their caterpillars. Or is it something more common like a garden tiger moth?
PS Following further investigation looks like a Drinker moth caterpillar.
Why have there been so many Drinker moth caterpillars on ispot lately? I suppose it must be a good year for them.
Lat/Lng: 53.9308, -1.1336
OS grid ref: SE569486