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It looks very like a Ruby Tiger larva but I cant onfidently say its not a Muslin Moth larva. Pics of both are available here in ukleps:-
I have never seen the Muslin Moth larva except in pictures but I have seen many Ruby Tigers and this looks good for one. Both could be seen at this time, suggested larval periods for both in ukleps include September.
Lat/Lng: 53.1044, -1.7676
OS grid ref: SK156563
Grassland all around.