A pamphlet etching was produced inscribed 'John Bull 1821' (aka John Martin!) which gave information, with arrow lines to guide the eye in sequence, to 28 of the various features compiled into the scene. I have attempted to replicate this here. Moving your mouse to the points of interest across the colour painting provides the original descriptive captions.
(see Balston, T John Martin 1789 - 1854 His Life and Works Page 260)