This little lot have been baffling me for some time so hope someone can help.
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Thanks to all those who identified these caterpillars. I have gone past the picture in Chris Manley's photographic guide several times without clicking onto the blue stripe and head simply because it looked a lot redder than my pics. A good one to know now for the coming year.
I have only encountered the Lackey caterpillar 'community' once before, it is posted here already, I think mine were slightly more mature and the stripey markings were more well defined as a result. I felt there was a reasonable chance your cats were less mature lackey, the blue/grey linear markings were what caught my eye, despite the hairy golden appearance of your caterpillars compared to the ones I met in May 07.
Is that bramble yours are on?
Lat/Lng: 51.0721, -4.1983
OS grid ref: SS460326
Large sand dune system stabilising behind the front row of dunes with a wealth of tiny and many other flowers and insects.