Iridescent pale blue ground beetle, about 30mm in length.
No interactions present.
Thanks for the help bphilp - I didn't do enough research to realise that my suggested id of carabus intricatus wasn't sensible as this species is only found in the South West,and I found this one in Bedfordshire!
Lat/Lng: 52.0327, -0.4366
OS grid ref: TL073382
Maulden Wood, Beds.