Sheffield is in the WEST Riding
register at: https://www.gro.gov.uk/gro/content/certificates/login.asp
https://www.freebmd.org.uk/ includes marriages, which are not on the GRO site. Generally has more flexible searching but does not include age at death before 1866, nor mother's maiden surname before 1912.
Also try exploring http://www.sheffieldindexers.com/
e.g. search Burial Records for Ernest Boden, he was buried in 1926.
Click on "Find Similar in Same Grave" and there is Ellen buried 1986, also another person who may be related. Various other indexes on this site.
That throws a spanner in my works!

Brian BODEN
BIRTH 2 NOV 1935 • Sheffield, Yorkshire, England
DEATH 4 NOV 2017 • Sheffield, Yorkshire, England
I was told that his mother was Ellen Naylor and father was Ernest, but Ernest died 1926 according to this!
Can't find a record to say that she remarried and had another 3 children including Brian!
She out lived him by 60 years!