About 7mm long and 6mm across
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Never gave much thought to what they look like when they're juvenille so thanks!
Have a look at the other observations at different stages.
Also this is quite a good identification sheet online.
Thanks to all contributors especially for the British Bugs site. I love these little creatures, they're so easy to watch.
Lat/Lng: 51.527666117232, -0.52116394042969
OS grid ref: TQ026820