Winifred Sandbrook was a sister in Queen Alexandra's Nursing Corps and according to her records was posted to India where she met and married Neville Brown - Constable. Maybe she came back before him but someone else mentioned a birth in 1923 in India. It's all a bit mysterious! I think Mavis Brown-Constable is her daughter-in-law, I can't find a marriage for her either so could have been overseas, the Brown-Constable's were a military family. Mavis is listed as single in the incoming passenger lists which could mean she was widowed or divorced.
Thanks for all your help! And thanks Rosie and millipede have just picked up the post and have found a marriage record but still no birth record for Beryl!
Wint