When fetching the twig photo, I noticed something red. I saw something scurry past at the time but on first look thought it had missed the frame.
Most of the creature is hidden in the groove. The obvious things are the huge antenna and the two segments which are grey, against the others in orange and red.
Ants are not my province at all. In the USA this could likely be a twig ant but we don't have those in the UK.
Or maybe we do...