Mike Robinson has been reporting a Black Redstart hanging around beside the Thames in the Erith area off Corinthian Manorway for the past few weeks on the London Bird Club wiki. He has kindly sent us this photograph:
The RSPB says ‘The Black Redstart is a small Robin-sized bird that has adapted to live at the heart of industrial and urban centres. Its name comes from the plumage of the male, which is grey-black in colour with a red tail. With fewer than 100 breeding pairs in the UK, the Black Redstart is on the Red List of Birds of Conservation Concern.’