I'd agree with that, Debra, and my model works with that yellow arrowed window. But why is that 'window' (red arrow) even there? does that signify that rooms 19 and 13 (the lean-to) were added AFTER the main Dorset street house was built?
Originally Posted by Debra A
Could the red opening be hidden by (or even covered over completely) by the sloping 'lean to' roof of No. 26, whereas the window marked with a yellow line belongs to No 27, is over the passage and the extension in that area under the window on #27 has a flat roof, level with the bottom of the window? The roof of the extension in the demolition photograph looks to e minus roof tiles and so the roof is slightly lower than it would have been, showing the opening?