She is Gwendoline F Martin Irwin, born July, 1922. I used your address for the site run by ancestry.com.uk and confirmed what you found. Gwen is listed as "Medway 2a, 1280" there. Her mother's name was Jessie Evelyn Bell. SHE served in WW I and was given the nickname "Dingy" Bell. Gwen's father, Harold Martin, was in the Royal Navy, but I cannot find accounts of him there . . . too many Harold Martins.