This etching by Thomas M'Lean dating from about 1828 shows the way in which the streets of the time were covered with advertisments. The bill to the left of the harp advertises 'Calais in five hours' (See Bar050, Calais Packet). The placard held aloft in the top left corner advertises a 'New Patent steam coach from London to York'

Charles Wright's champagne was renowned for its cheapness and critics asserted that it was not French in origin. Wright took the matter to court in 1827 [Matoff, S; Conflicted Life: William Jerdan, 1782-1869, London Editor, Author and Critic, p171]
This Advertisement for Charles Wright's Champagne, Engraved by George Hunt, appeared at about that time. In the background three decrepit individuals stagger beneath a sign reading "Baths" and to the right two healthy looking men stand beneath signs reading "Charles Wright's Champagne."

Cherry Ripe (Roud V347) in a setting by Charles Horn was published in 1825 [British Library H.1653.q.(9.)] and made popular by Eliza Vestris who sang it in the musical comedy Paul Pry so the song can be no earlier than 1825

London's population was one million at the time of the first census in 1801 and it more than doubled by the second census in 1851.(i). The noisiness of London streets was a common source of complaints made by middle and upper class Londoners. The concomitant increase in use of coal as both domestic and industrial fuel resulted in the smogs for which London became notorious.

(i) Old Bailey on Line https://www.oldbaileyonline.org/static/London-life19th.jsp