|Magnified head showing dark mouthparts.|
|Closer still to see where the mouthparts protrude.|
|One of the rough locomotory pads, near the rear end.|
|Close-up of the mouthparts while still in the head segment.|
|Overall shape of mouthparts - note the prongs and notches.|
|Again, an overall view with attached muscle fibres etc.|
So, what is it? Well, the mouthparts and overall body form strongly suggest that it is in the family Muscidae, though I'm can't be sure beyond that as the spiracles were difficult to see. It looks closest to Phaonia sp. though most muscid larvae are carnivorous (e.g. hunting other larvae in damp places or organic matter) and found in various substrates. Therefore, it could easily have been picked up by a foraging bird and then deposited dead but undigested with fruit remains. Any thoughts, including revised ID (e.g. could it be Dolichopodidae instead?) most welcome...
Smith, K.G.V. (1989). An Introduction to the Immature Stages of British Flies. Diptera Larvae, with Notes on Eggs, Puparia and Pupae. Handbooks for the Identification of British Insects 10(14).