Weevil - around 6mm long, but unsure as to type.
No identification made yet.
No interactions present.
The photo is a bit dark, what colour was it in real life?
Entomologist and biological recorder
Black - slightly yellowish lines down its back
I'm not sure I'm going to be able to help with this one, but was it associated with any particular plant? And are you sure it was 6mm long? - it looks a bit like some of the weevils in family Apionidae but they are mostly nearer 3mm:
It was photographed on a swing, running along the top bar. There are vine weevils in the garden, but they are larger than this. 6mm is approximately the size - any variance would be 2mm either way.
I think that you will find that it's the Willow Gall Weevil.
I don't think it can be Willow Gall Weevil (Archarius salicivorus), as that has a longer, thinner rostrum ('snout') and shorter, wider elytra (wing cases). See:
But I still don't know what it is!
Lat/Lng: 51.5, -2.6
OS grid ref: ST6282