You have put :
'Deaths Jun 1955 Cox Violet age 73 Bolton 10b614'
this would put her birth as 1882, but the 1939 has her as born 1884, so you already have some contradictory information for your ancestors.
As regards the 1939, she claimed to be married in 1939. He was not in the household on that day. If he has bunked off, whereabouts unknown, or under different name living locally, how would she know if he is dead or alive?
What is his exact date of birth - then you can search the 1939 for him that way?
Added:
On 1911 she is 24, so born 1887/6, so very different from age at death.
What is Violet's Father's name from the marriage certificate, as the most likely Violet I can see, if born Bolton, was in 1885, and no sign of a father in 1891 or 1901?
Added:
Is he Peter from West Houghton, in 1881?