As well as Arthur

Name: Arthur J Payne
Year of Registration: 1915
Quarter of Registration: Apr-May-Jun
Mother's Maiden Name: Payne
District: Cardiff (1837-1974)
County: Glamorgan, Monmouthshire
Volume: 11a
Page: 845

I wondered if there were any further siblings ?

Do any of these fit and help narrow a lifespan or later marriage for Florence ?

Name: Leslie A Payne
Year of Registration: 1913
Quarter of Registration: Apr-May-Jun
Mother's Maiden Name: Payne
District: Cardiff (1837-1974)
County: Glamorgan, Monmouthshire
Volume: 11a
Page: 929

Name: Catherine Payne
Mother's Maiden Surname: Payne
Date of Registration: Jan Feb Mar 1917
Registration district: Cheltenham
Registration county: Gloucestershire, Shropshire, Herefordshire
Volume Number: 6a
Page Number: 636

Name: Phyllis Payne
Mother's Maiden Surname: Payne
Date of Registration: Apr May Jun 1918
Registration district: Cardiff
Registration county: Wales
Volume Number: 11a
Page Number: 717