No interactions present.
Many thanks to Christian Owen who gave the link to a free downloadable guide to these beetles in a previous post... it is No 10 on the list here: http://johnwalters.co.uk/publications/guide-to-british-beetles.php
Thanks for the ID. I've agreed A aenea on the basis that examples I can find look more convincing than Poecilus and your comments seem very well informed!
Lat/Lng: 52.061168, 1.159024
OS grid ref: TM166450