Thank you both so much!
So she was known as Lilian Newell but her birth name was Eva Lilian Allison, she’s supposed to have married a George Newell in Norfolk and they had one child in 1932 (still living) she went on to have four more children who are registered Newells but definitely aren’t George’s offspring.
I only found a registration thing rather than an actual birth certificate that says Eva Lilian Allison, no parents listed, and the 1911 census which says William Allison, agricultural labourer at Prior’s Farm, Shouldham Thorpe, Norfolk and Louisa Jane Allison. No maiden name on there. My mother didn’t know her grandparents but knew their names were William and Louisa so I felt I was on the right track there. She thinks her mother, Lilian, left home at 13? Possibly went into service?
I have a messy public tree on ancestry.com which is full of mistakes as far as this maternal line goes, will see if I can link if that’s any use. Really appreciate any help with this. Thanks again.