I'm trying to find a marriage record for
Lillian Rose Morgan B.19/08/1898 and
William Lewis Rees B.09/11/1879. Lillian Rose was born Morgan.
Lillian married a Mr Sydney Edgar Collins on 29th September 1898. In the 1911 census she is with Mr William Lewis Rees B1879 in Llanwanno. They are still together in the 1921 census with her children from the previous marriage and had three more children.
I have spent ages looking for a marriage record. With her surname Morgan or Collins. I even looked under Challicomb. The only thing I can think of is that maybe they didn't get married and lived DeFacto. Her parents were Edward and Matilda Morgan.
No middle names could this be a possible entry for their marriage

Jun 1918
Collins Lilian Rees Cardiff 11a 775
Rees William Collins Cardiff 11a 775
Edit to add for info.
William Lewis REES & Lilian REES
also at same address are G S COLLINS & L A COLLINS
Residence Date 1931
Residence Street Address 1a Vaughan Terrace
Residence Place Glamorgan, Wales
Parliamentary Division Aberdare
Glamorganshire, Wales, Electoral Registers, 1832-1978
Lilian R REES & G S. COLLINS
Residence Date 1951
Street Address 4 Lowlands Cres.
Gwent, Wales, Electoral Registers, 1832-1969