Confidence: It might be this.
Notes: We have a groundbeetle with antennae pale at the base; pronotum without sinuation on the sides and rounded hind-angle; legs with some pale. Crucially, we don't know the size, nor see the palps or front legs, so some speculation is involved. It is unlikely to a rare (and therefore unfamiliar) species. Nebria looks quite like this, but has the prontum quite different. Pterostichus madidus has the right pronotum, but entirely dark legs and nearly entirely dark antennae and is more 'powerfully built'. I think - and it is little more than a suggestion - that it might be an Agonum species. If so, it should be between 5.5 and 8 mm long, have a toothed mentum (turn beetle upside down and examine front of the head); 2 setae (bristles) on the inside edge of the eyes; a notch in the front tibia. This list is not conclusive, but would greatly support the hunch.