A beetle, looks most like Bloody-nosed beetle although it did not do any 'bleeding' when I observed it.
No interactions present.
New to this area but visited a locale museum with a fine natural history section and bells range.
Having looked again I see the difference around head and legs it is Timarcha. A littal over infusiastic on my part
Yes to Timarcha! There are two species, the Bloody-nosed Beetle T. tenebricosa and the Lesser Bloody-nosed Beetle T. goettingensis. Easiest way to tell them apart is by size, although even so there is a degree of overlap between the two. I wouldn't like to make a guess at the species without knowing the size, but maybe dshubble will recognise it?
It's not a Colorado beetle! That's in the same family but looks very different (black and yellow stripes). It's a notifiable pest and thankfully isn't esablished in Britain.
Entomologist and biological recorder
My recollection is that it was about 10-15mm long but I didn't measure it accurately.
Lat/Lng: 51.2, -0.4
OS grid ref: TQ1350