@clebby only just seen that sorry, not sure, but from what i can gather it's a victorian row of houses and I think they used to have an extension or a window. Maybe some sort of stupid regulation made them brick it up?
Cheers for the comments guys! Hopefuly these new London members will get in and have a look
My grandfather, Albert George Mussell, worked at Burgoynes in the 1910s/1920s and maybe later, as a pharmaceutical chemist. In the first and third photos, he is the man in the lab coat. I don't know the names of the other people.
Those houses are actually flats (in Brooks Ave). I used to live at 37a where our garden over looked the rear of this place. At the time it was being used by Newham Council as storage.
The parts that are bricked up were a door that opened up from a foyer. There used to railings there to stop you falling out. The upstairs flats were fairly basic. The bath was in the kitchen which usually had a wooden cover over it when not in use. The toilet was next door, accessed from the foyer where those bricked up doors are.