For info.
Walter M Francis
Beatrice Burden
marriage entry Jun 1937 Worthing
If the above is Cyril's brother then Cyril was still alive in 1947
You would need the m/c to confirm if Walter's father is named John Percival Francis
This appears to be the death of Walter's wife
FRANCIS Beatrice born 29 12 1915 died Sep 1999 registered Barnet Middlesex
Her birth entry
Dec 1915 BURDEN Beatrice mmn Downey E.Preston
The female Burden with Walter & Beatrice on the Electoral Register from 1948 also has mother's maiden name Downey her birth registered Sep 1926 E Preston
Possible parents marriage entry
Burden/Downey Dec 1913 E Preston
There this family on 1921 census
Ernest Burden 1884 Worthing, Sussex
Christine Burden 1892 Sussex, England
William Burden 1914 Worthing, Sussex
Beatrice Burden 1916 Worthing, Sussex
Weara Burden 1919 Worthing, Sussex