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@Big_Block
Depends on how correct you are aiming for. The Simplex TDF comes later. It was preceded by the Simplex Champion du Monde which came in a variety of speed/chain options
The Simplex Rigidex was a touring orientated derailleur and was marketed under a variety of names. They can be seen in the 1939 Brown Bros catalogue on page 167
The early racing models capacity was very limited, with a greater range available with the touring models.
More background on the Simplex derailleurs is in Raymond Henry's paper
The GB Hiduminium brakes were certainly available from 1946 with the calipers getting the familiar Hiduminium stampings from late 1946.