I strongly recommend that you read both the Dos Santos and Gurney posts which deal with Matania's extremely strong visual memory and his ability to compose an illustration on the fly, without preliminary studies. The Wikipedia biography offers background information about his career journey from Italy to France (briefly) and on to England, where he spent the rest of his life.
First, some examples of his commercial work.
Matania seems to be best known as a war artist. He liked to paint pretty women, so the munitions factory scene is populated with them.
This was probably painted only a few years after he moved to London in 1904. The omnibus route signs suggest that it went from the West End to northern boroughs, but here it is probably pictured near Piccadilly, to judge by the women's clothing.
I don't have a date for this poster, but one web site featuring it says circa 1933. There's a green car in the background with an early fastback body, so that inclines me to peg it more like 1935, but probably not much later. Note the Art Deco design on the front of the building. I seriously need to get my time machine fixed so that I can join that crowd.