That's great information - much appreciated. I'm hoping that the National Archive files I've ordered will include that sort of information. I know the area well from the Underground Map - the ancestor I'm researching and his brothers all lived around the area - Carter Street, Eric Street, Treby Street itself and English Street. Treby street is still there, but Carter Street is gone.
The E Youldon information is very interesting. My ancestor Frederick William Pike lived at 9 Carter Street, and in the 1911 Census and on his 1912 marriage certificate his profession is glass blower, but no company was mentioned. In 1914 he joined the Royal Artillery, and served until 1919, In the 1921 Census he's working at Amalgamated. So I think it's probable his pre-war employer was Youldon, and that was taken over by Amalgamated. Amalgamated wound up in about 1932, and Frederick ended up as a cable-layer for the Stepney Electricity Company.
Many thanks for your reply.
Tony