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Looks to be correct- the Ellen Fitzgerald (nee Phelan) on the 1939 register matches this birth in Kilkenny:

Name ELLEN PHELAN
Date of Birth 15 January 1907
SR District/Reg Area Kilkenny
Sex Female
Mother's Birth Surname MAHONEY

AustinQ,

Good.

I had been concentrating on the other John J birth (Poplar not Marylebone), but was deciding it looked like the wrong family as that John J was still with the same people on ER's after the marriage.

This is a possible death for Ellen;
Ellen O'Sullivan
Birth Date: about 1908 Age at Death: 56
Date of Registration: March quarter 1964
Registration district: Willesden Middlesex
Volume: 5f Page: 278

This could be death for Joan's husband Bertram:
Bertram Charles Williams
BIRTH: 27 May 1931
DEATH: July quarter 2001 - Waltham Forest, London, England

Johanna??
MS Joanah Williams
Gender: Female
Age: 75
Birth Date: 1934
Death Date: 18 May 2009
Residence Place at Death: London, Greater London, England
Postal Code District: Se22

Posting for Susan in case she could not find the thread, with the information that:

'my father's parents were Ellen phelan and Joseph Fitzgerald, both from Ireland'

Susan didn't return three years ago - it's unlikely she'll be looking now. Unless you know otherwise, of course ;-)