One part about 5cm long, the other about 3cm long. I'm guessing a mammal, possibly a deer?
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Thanks for suggestions. I think it's more likely to be deer, as there are no sheep around there. There used to be deer around this piece of land a couple of years ago, but I haven't seen them recently - perhaps they're back.
Lat/Lng: 51.5, -1.8
OS grid ref: SU1987