Loretta Alvarez placed the cardboard envelope on top of some boxes by the communal bins outside her flat in Feltham, west London , which are shared by 25 other households.
Scores of St George and Union Jack flags have sprung up on lampposts and buildings across parts of Northfield, Birmingham , in what organisers have described as a 'patriotic outpouring'.
Amid mounting fury at the Labour-run council over the chaos, with rubbish piling up and rats running riot on the city's streets, No10 urged Unite to negotiate 'in good faith'.