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It looks like a Ruby Tiger dyed red. Muslin Moth larvae seem to be redder than RTs but their larval stage is given as June to Sept in ukleps. Have you tried ukleps yet?
Yes David I thought the Muslin larva in ukleps seemed more reddish than the Ruby Tigers, I just wish they had a few more pics. The only thing I always notice when I view the Muslin moth larva in ukleps is that it doesnt seem to be as densley covered in hairs as the RTs- I have no personal experience of Muslin Moth larvae.
Just looked again, I'm refering to the last 2 images of what seems to be the same larva. The 3rd from the bottom on the other hand seems as hairy as an RT and similarly drab- I couldnt say that one wasnt a Ruby Tiger if I found it.
Lat/Lng: 51.4444, -0.9431
OS grid ref: SU735722