This large and colourful bug is a Hawthorn shieldbug, Acanthosoma haemorrhoidale, which was feeding on a meadow crane's bill.
I'm not sure how I spotted this cryptic Sloe or Hairy Shieldbug, Dolycoris baccarum on a buddleia seedhead.
This forest shieldbug, Pentatoma rufipes, was crossing the path.
Finally, a late instar nymph of a Green shieldbug, Palomena prasina, under a budleia leaf.
Click here for a great resource for the identification of British bugs (Hemiptera).