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Not really possible to ID the species from this photo.
Tachinid Recording Scheme
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It's the larvae of a species from this family (excluding Large Red), but as the family contains many of the more common species that won't be much help.
It's also a fairly early instar larva, so still has a few moults to go through before it is anywhere near mature (and early instar larvae can be more difficult to ID - even if close up photos of the relevant areas are available).
Lat/Lng: 52.63814, -0.38659
OS grid ref: TF092057
Freshwater pond surrounded by trees.