We had a visitor in the arm. Just managed to get a picture.  Kingfishers are small unmistakable bright blue and orange birds of slow moving or still water.

They fly rapidly, low over water, and hunt fish from riverside perches, occasionally hovering above the water's surface. They are vulnerable to hard winters and habitat degradation through pollution or unsympathetic management of watercourses. Kingfishers are amber listed because of their unfavourable conservation status in Europe. They are also listed as a Schedule 1 species under the Wildlife and Countryside Act offering them additional protection.