The 1946 Electoral Register for 35 Belton Rd, Willesdon, shows the following individuals:
- Burt, Eva
- Burt, William C.
- Goodman, Florence M.
- Weston, Percy E.
Florence and various other family members were at this address through the 1960s; it is worth checking every year's electoral roll.
This suggests that the daughter who was the informant was Florence May Goodman (nee Weston), born c.1897:
Births Jun qtr 1897
Weston Florence May Hendon 3a 181
As you know, Florence (Mason) appears age 4 on the 1901 census with Milly. She is probably with Milly in 1911 though that record still needs to be found, if it exists.
The 1939 Register Index shows a Arthur J. Goodman and Florence M. Goodman living together in Willesden. The image would have to be purchased for full information, however from the index it is possible to obtain the following information:
1939 Register index:
Arthur J Goodman 1890 Willesden M.B. Middlesex
Florence M Goodman 1897 Willesden M.B. Middlesex
Arthur Goodman 1934 Willesden M.B. Middlesex
+1 more person officially closed
In the GRO birth index there are the following entries:
Births Jun qtr 1934
Goodman Arthur J. mms Weston Willesden 3a 540
Weston Arthur J. mms Weston Willesden 3a 540
The fact that this birth is indexed under both the father's surname and mother's maiden surname suggests that the child was illegitimate.
Also, as Arthur J. Goodman (Jr.) appears in the 1939 Register index, he is presumably deceased. Looking at the GRO death index, there is a likely death for him in 1952, in Willesden, age 17.
There is another son, birth registered in Mar qtr 1937, registered only under the surname Goodman. This is likely the closed person on the 1939 Register index. This son (and his wife) appear on the electoral registers with Florence in the 1960s, still at the address of 35 Belton Rd, Willesden.
Arthur J. Goodman died in 1945 in Willesden, explaining why Florence's husband is not on the electoral register with her in 1946.
Looking at earlier electoral registered, the following individuals are recorded on the 1935-36 electoral registers at 24 Essex Rd, Willesden:
- Goodman, Arthur James
- Weston, Florence May
- +others likely unrelated
Arthur is at that address on the 1934 electoral register, but Florence is not recorded with him.
Arthur and Florence are at that address on the 1937 electoral register, but now Florence's surname is now Goodman.
All this would seem to suggest a marriage in about 1936, though I have been unable to locate one.