Sorry it is blurry, it is the best one I have of this one in a bug pot.
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Apart from the blurriness the problem here is that we're looking at the underside, and no-one has yet written the field guide to the undersides of bugs - would be useful if someone did, for all those insects that you see on the other side of a window-pane!
But I think it must be one of the true bugs, and judging by the little bits of colour that can be seen on the wing and legs my guess would be Rhabdomiris striatellus. This is a real shot in the dark though, so don't take it as a confirmed record!
See the British Bugs website for more on Rhabdomiris striatellus:
There are some other similarly coloured species (but their legs don't seem to match your photo so well):
It's often tricky taking photos of these small insects but if you can get views from several different angles that can often help get things identified.
Entomologist and biological recorder
Lat/Lng: 51.2, -0.4
OS grid ref: TQ1350