Larva of either Stag Beetle or Lesser Stag Beetle. Not sure it is identifiable to species level.
No interactions present.
Have you seen Maria Fremlin's useful guide to larvae:
It can be quite tricky to tell Stag and Lesser Stag apart, and some of the chafer species are rather similar as well. Would be useful to know the size and where you found it (i.e. was it in the soil, in wood, in a compost heap etc.).
Just noticed that there appears to be an adult beetle in the bottom-left of your photo! Does that shed any light on the matter or is that just coincidence?
Entomologist and biological recorder
It could well do - the beetle's a lesser stag, and the adults and larvae are often found together, above ground rather than the below-ground timber typical of Stags
Record your ladybird sightings!
Lat/Lng: 51.540316447216, -0.32921433448792
OS grid ref: TQ159837