Lilian M Day birth registered March Quarter 1936 in the Registration District of Newport, Monmouthshire, Reference 11a 300. Mother's maiden name was Waters.
Possible marriage of parents could be:
Edwin Day and Gwendoline H. Waters, September Quarter 1929, Pontpool Registration District, Reference 11a 387
Obtaining Lilian's Birth Certificate would confirm or not that Edwin and Gwendoline were her parents.
Ray