It is quite some time since I used FreeBMD and I surmise additional 20th century data has been transcribed, since while searching for Mary Maria MAPLETHORPE 1878-1964 I came across a marriage to 'CARTER'. The later marriage returns (I think, post 1912) list the name of the spouse, though only the surname.

FreeBMD returns a marriage for Mary Maria MAPLETHORPE 1878-1964 to Samuel DIXON 1869-1906 in September 1897 though her name appears as Mary Maria MABLETHOPE. FreeBMD returns a second marriage in June 1913, this time the spouse is shown as 'CARTER'. At this moment in time I have no information regarding when or why her first marriage to Samuel DIXON 1869-1906 ceased.

I know my grandmother Ivy JACKLIN (née Ivy DIXON 1901-1983) and Kathleen LOCK (née Kathleen CARTER 1917-Deceased) were step-sisters but sometimes names in families can be very misleading. My relatives from Marton, Lincolnshire always referred to Ivy DIXON 1901-1983 as 'Granny Carter' and it is only recently as I delved into her family history that have I learned of Samuel DIXON 1869-1906, her biological father.

My family is in possession of Mary Maria's death certificate in which she is described as the widow of Joseph CARTER. So this gives a forename to 'Carter'. Further searches on FreeBMD returns a birth for one Joseph CARTER in March 1877. This birth was registered in the Gainsborough district. This fits my expectations so I will consider it correct it until proved otherwise.

Just to throw a little spanner into the works, Ivy DIXON 1901-1983's marriage certificate records George DIXON as being her father, not Samuel DIXON 1869-1906 as I would have expected. This needs further research.

Notes:
Since I wrote this I have spoken with one of my relatives at Marton, Lincolnshire and I now have my doubts about this Joseph CARTER.

Updates:
2016-11-01 My doubts over this proved to be correct. This post provides details of the correct Joseph CARTER.