An unfinished watercolour from 1825 showing the north aisle of Bristol Cathedral. The underdrawing is almost complete and, in keeping with Johnson's exact style, its lines are meticulous to the extent of being fastidious. The colouring has been commenced - a simple grey wash giving shadow and three-dimensionality, and a yellow wash giving colour and body to some of the stone features. The partly-drawn stained glass on the far wall has just enough dabs of colour for the artist to later visualise how the window looked, but the light brown colour, picking out features in the aisle made of wood, is sparing and tentative, and the heavier brown of the screen is tonally inaccurate.

This view was originally commissioned by John Britton, possibly for his History and Antiquities of Bristol Cathedral published in 1830, but never used. (The view of the north aisle that does appear in Britton's publication is by W. H. Bartlett.) Johnson drew and partially coloured it on the spot, and perhaps he intended to complete it later by adding the last of the pencil drawing and colouring. The Bristol antiquarian, George Weare Braikenridge, the eventual owner of this work, noted that Johnson left it unfinished when he followed the Bristol artist Francis Danby to London in October, 1825.