2.5 cms long. Docile resting on a warm tarmac path.
No interactions present.
You can edit your observation to put it in the "Invertebrate" category. Then you will be credited with your correct identification.
To be strictly accurate scientific names should only take a capital letter on the first (genus) part. No sense in correcting it here though as iSpot ignores case when matching images.
Lat/Lng: 51.50977, -0.66339
OS grid ref: SU928798