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With a Harlequin larva in the background - interesting.
Pupa I think you meant - not larva
Are you sure its not a 7 Spot pupa?
Gardening for Wildlife
I think it could well be a 7 spot pupa. Can't see any of the "bristly" parts of a Harlequin.
Lat/Lng: 54.855, -4.908
OS grid ref: NX134550