Doing a bit more detective work on Evadne Price (aka Helen Zenna Smith), I’ve tried searching for her on Ancestry. I’ve discovered nothing yet to indicate whether Wikipedia or the ODNB is right about her date of birth, but I did find her in some electoral registers and telephone directories of the 1920s.
She lived in a flat at 29 Dulverton Mansions, on the Grays Inn Road. (see the picture above). Her phone number was MUSEUM 2394.
For most of the time she lived there with a Miss Dorothy Fletcher. I would speculate that this was the sister (or other relative) of Charles Fletcher, whom she had married in 1920. He was a soldier (Captain in the 3rd Devonshire Regiment) and so presumably away from home most of the time. He died in the Sudan in 1924. It’s interesting that she kept her maiden name not only in the phone book, where it would be handy for editors and so on, since Evadne Price was the name that she wrote under, but in the electoral register as well.
But here’s a thing. In 1919, before her marriage, she is listed in the Hampstead and Holborn electoral register.
She is listed as in Division III of the register, which I think means she has the right to vote in local elections, but not in parliamentary ones. Does this say anything about her age, or only about her economic status? I’ll try to find out somehow.