Thanks for all responses concerning the Bletchley Girls, I found Mary Ratcliffe's story thoroughly fascinating because of her actual participation during WW2 years.
The mention of Alan Turing reminded me of a very good movie, more like a documentary of Alan's life story shown on Netflex movie channel. The film is called Codebreaker with Ed Stoppard playing the leading role.
I have not yet seen the Benedict Cumberbach version of Alan Turing but, I am sure it will not be as accurate or as convincing as Stoppard's movie.
Such a shame about Alan Turing, a genius, who was treated disgracefully by the government because of his sexual preference.