Well there is a further update
I have now received the marriage certificate in 1959 for Charlie Richardson and Ethel Quin
(yet more evidence of my incorrigible nosiness).
The bride is is shown as
aged 31 years at the marriage date of 14th February 1959 - which fits with a 19th January 1928 birth previous marriage dissolved - which fits with Carole's discovery of the Geoffrey Baird divorce/remarriage
father: George QUIN (deceased), Adoptive father, Engineering fitter.
I have an extensive Quin/Wills family tree, but the only George Quin I have so far is Ethel's uncle, who was unmarried in 1939, and seems unlikely to be an adoptive father. Ethel's grandfather, William George Quin was however a 'general fitter - engineering) in the 1939.
We will of course have to see what the adoption records may reveal.
Added: If I were Ethel's daughter, I would also be investing in Ethel's sister Agnes's birth certificate to see if she, too, was adopted. However, I do indeed appreciate the costs of doing this sort of research, as we all know.