Marsh Tit
The Marsh Tit (Poecile palustris) is bird listed as Red Status by the RSPB. Red is the highest conservation priority, with species needing urgent action.
The Marsh Tit and Willow Tit are very similar, and the only way to tell them apart with a high degree of certainty is by their call. There are other subtle differences, and the Marsh Tit usually has a white mark on it's bill, and a glossy black cap. Both can be seen in my photograph.
