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The subject matter is the enormous and largely manual task undertaken in the 1920s and 1930s to construct the UK National Grid for electricity.
When my grandfather died in 1974, I came across a large brown envelope of photographs he had collected during his time working as a foreman cable-layer in London during the 1920s to 1930s and squirrelled away. They could be dismissed as just a load of blokes digging holes in London streets, but I found them interesting as they showed the work involved in the construction of the National Grid and working methods from nearly 100 years ago.
They also created a giant puzzle as few of the photos are labelled. I like a challenge and decided to try to work out exactly where the photos were taken and what the locations look like in the 21st century. In most cases I have been successful and put together brief histories of the locations and supplemented them with maps, screenshots from Google Street View, and in some cases historical aerial photographs.