Thank you Peter for your interest. I did, sometime ago, order the birth cert you mentioned but like you dismissed it as not the one I am looking for! Never considered she may not be using birth name - heck that throws up another can of worms!
Janet thank you for your input - my Mother's birth cert states she was born on 20 April 1918 22 Annie Road Bootle Lancs. I know they moved to Wallasey at some point and my grandmother died there. My mother always maintained that her mother said she was born on 1st May( this is recorded in 1939 census) but didn't really know the year and due to vagueness on 1939 census feel fairly certain this is her. My mother started her nurse training with Red Cross and was not living with her mother in 1939 and due to 100 yr rule on 1939 census can't find exact location at the moment. She went on to reside at Coventry and Warks hospital completing SR nurse training in 1944.